Not so fast Soyeong, either we are justified by Faith Alone, or by works, or by both. Only one of these is correct. Paul himself gives the answer in Romans 4. Let's look at these passages.
My position is that the same faith by which we are justified is also expressed as good works, but that we do not earn our justification by are works, so I am in agreement with Romans 4. So when someone does good works like helping the poor, the connection to being justified is not that is helping to earn their justification, but that it is expressing their faith.
Abraham Justified by Faith
1 What then shall we say was gained by Abraham, our forefather according to the flesh?
2 For
if Abraham was
justified by works,
he has something to boast about,
but not before God.
Let's stop here for a minute. Paul says IF Abraham was justified by works, he has something to boast about, meaning he has a due owed to him. He has something to boast that he earned, that he did, that he merited, that he fulfilled by his works, his hands. Paul says, but not before God. Why not? Because Abraham is also a sinner in need of God's Grace and Mercy like us. In other words no flesh will be justified through the Law! This door is now shut to all sinners in Adam! Let's continue.
If someone earned their justification as the result of their works, then they would have something to boast in themselves about, but if someone did good works because of their faith in God, then they only have room to boast in God (1 Corinthians 1:31). In James 2:21-24, it quotes Genesis 15:6 saying that Abraham believed God so he was justified in order to support saying that Abraham was justified by his works when he offered Isaac, that his faith was active along with his works, and his faith complete his works, so his works were an expression of his faith in God, which did not give him anything to boast in himself about before God. God's law can be obeyed for any number of reasons other than in order to earn our justification as a wage or in order to have something to boast in ourselves about, so what the Bible speaks only against incorrect reasons for obeying it should not be mistaken as speaking against our justification requiring us to be a doer of the law for the correct reasons. All those who have faith are doers of the law and only those who have faith will be justified, so everyone who is not a doer of the law will not be justified, though we do not earn our justification as a wage by being a doer of the law.
3 For what does the Scripture say? “Abraham believed God, and it was counted to him as righteousness.”
Now how can God count Abraham's faith as righteousness? He didn't do anything to merit it through righteous works. He is ungodly and a sinner like all if us. Isn't this against Scripture to pronounce a guilty man innocent? Yes, it is. So how can God count this guilty sinner righteous? It is because of the Promise God made to Abraham that God will send a Promised Seed that will save his people from their sins, and he will fulfill the Law perfectly and merit righteousness and become a curse for them. Christ will take our place on the Cross and bear our curse, death, punishment. And we will receive his righteousness, sanctification and be counted righteous! This is how God can be the Just and the Justifier of the ungodly!
While it is true that Abraham believed God, so he was justified, it is also true that he believed God, so he obeyed God's command to offer Isaac (Hebrews 11:17), so the same faith by which he was justified was also expressed as obedience to God. Again, James 2:21-24 quotes the same verse as Romans 4:3 in order to support saying that Abraham was justified by his works when he offered Isaac, but it is speaking about works done as an expression of his faith, not works done in order to earn a wage and have something to boast about, which is what Romans 4 is speaking against.
To say that someone is righteous means that they practice righteousness and God's law is His instructions for how to practice righteousness, not for how to earn our righteousness as the result of our obedience. So the conteont of the gift of becoming righteous is the experience of becoming someone who practices righteousness and the way to become righteous is by grace through faith, not earned as the result of practicing righteousness. Christ practices his righteousness by living in obedience to God's law, so that is also the way that we live when we receive his righteousness, but you want to receive his righteousness without becoming someone who practices righteousness, which is not only a contradiction, but is robbing the gift of righteousness of its content, so it is like you want to box that the gift of righteousness came in, but not the content of the gift itself. A salvation where we were only counted as righteous, but not counted as someone who practices righteousness would be selling our salvation far short of the salvation that God has in store for us.
In Acts 3:25-26, Jesus came as the Promised Seed to bless us by turning us from our wickedness, and God's law teaches us how to do that, but you consider that to be a curse rather than a blessing.
4 Now to the one who works, his wages are not counted as a gift but as his due.
5 And to the one who does not work but believes in him who justifies the ungodly, his faith is counted as righteousness,
See how marvelous the good news is for the ungodly, Soyeong? God counts the ungodly righteous through Faith Alone apart from works! Also notice the juxtaposition (contrast) works (law) vs gift (promise). I believe is this the huge part you are missing in your position. Paul is crystal clear in these passage that God counts faith in his promise (Christ) as righteousness; because of the Righteousness of Christ given through the Promise and received by faith alone apart from works of the Law.
While a gift can't be earned as a wage, the content of a gift can itself be the experience of doing something, such as giving someone the opportunity to to experience driving a Ferrari for an hour, where the experience requires them to do the work of driving it, but where doing that work has nothing to do with trying to earn the gift as a wage. Similarly, the content of God's gift of eternal life is the experience of knowing God and Jesus and the gift of God's law is His instructions for how to have that experience (Exodus 33:13, Matthew 7:23). Likewise, the content of the gift of righteousness is getting to experience practicing righteousness, but you would have Christ rob us of that gift by experiencing it for us.
In Matthew 4:15-23, Jesus began his ministry with the Gospel message to repent for the Kingdom of God is at hand, which was a light to the Gentiles, and God's law is how his audience knew what sin is, so repenting from our disobedience to it is a central part of the Gospel message, which is in accordance with Jesus blessing us by turning us from our wickedness in accordance with the promise (Acts 3:25-26), which is the Gospel that was made known in advance to Abraham in accordance with the promise (Galatians 3:8), and which he spread to those in Haran in accordance with the promise (Genesis 12:1-5). In Genesis 18:19, Genesis 26:4-5, and Deuteronomy 30:16, the promise was made to Abraham and brought about because he walked in God's way in obedience to His law, he taught his children and those of his household to do that, and because his children did that. So spreading the Gospel by blessing others by turning them from their wickedness and teaching them to walk in God's way in obedience to His law is the way to have faith in the promise.
6 just as David also speaks of the blessing of the one to whom God counts righteousness apart from works:
7 “Blessed are those whose lawless deeds are forgiven,
and whose sins are covered;
8 blessed is the man against whom the Lord will not count his sin.”
David also recognizes the blessing of the Promise to whom God counts righteousness apart from works of the Law! Soyeong, the Gospel is an announcement of this marvelous good news for sinners. That God gives in the Gospel Promise to those who believe or receive through Faith Alone!
And not by anything we can do through the Law, which is an impossible endeavor to accomplish for any sinner! Understand Paul on the perspectives of Law & Gospel; Curses & Promises; imperatives & indicatives; works & gift; condemnation & justification; legalism & Grace. And this coming from the greatest Pharisee that protected the Torah and persecuted Christians!
The Psalms express an extremely positive view of God's law, such as with David repeatedly saying that he loved it and delighted in obeying it, so if you believed that the Psalms are Scripture and therefore held the same view of the law that they express as Paul did (Romans 7:12), then you would consider it to be the antithesis of the good news to be counted as someone who does not have the gift of getting to practice righteousness on obedience to God's law through faith. While we become righteous apart from having done any works to earn our righteousness as a wage, that does not mean that we become righteous without becoming someone who practices righteousness in obedience to God's law. In Roman 15:18-19, Paul's Gospel involved brining Gentiles to obedience in word and in deed, so his Gospel was also in accordance with Christ's Gospel in calling for obedience to God's law.
By Grace Alone in Christ through Faith Alone!
In Psalms 119:29-30, he wanted to put false ways far from him, for God to be gracious to him by teaching him to obey His law, and he chose the way of faithfulness by setting God's law before him, so this has always been the one and only way of salvation by grace alone in Christ alone through faith alone.