Looking for a specific manhua

I think it was a shounen ai ,it was about an old man and an young guy ,the young man moved in the neighborwood with his familly and started to go to the old man's house ,the father of the young man was the guy the old man was in love with whene he was younger ,(he even wrote him a confession letter or something but didnt give it to him ) the young guy started to like the old man ,at first he (the old man )rejected the young one but in the end he decided to give it a try ,for what i remember the first scen of the manhua was in the rain (sorry for my bad english lol )