@ah Meng
You said you watched 后来的我们
Actually there is a song title named 后来的我们by mayday.
After Rene Liu listening this song composed by mayday then she suddenly had a emotion and decided to film this drama.
I think the story is about 2 person loved each other but then they become 最熟悉的朋友 at the end.
有了后来
没有了我们
这就是后来的我们。