Resolved BL novel where both mc reborn and ml time travelled back to past

I am looking for novel where mc died and got back to where he was a child.And ml got back to the past shortly after.The moment they found out that they both got back to the past was because of the painting that mc painted in the competition of their future house.Mc was illegitimate son of ml dad?I'm not sure.But they both stayed at the same house so.And Ml skipped grade and ml invested into the movie that will be popular in the future.

 

Think it's Little Terrified Bun

 

That's it.Thank u!!!!!

 

You're welcome! Remember to edit the thread from Forgotten Title to Resolved if we're done ^0^)/