Need help finding a manwha

Sooooo, it's a yaoi about a uke that is the iligitamate son of a powerful dude that has anoughter son(the seme) who the father loves while he hates the uke. The son/seme is a suck up to the dad. But while the son/seme treats the uke like shit the uke is infatuated with him as they are and have bebeebebeen sex partners first searingly a while. But eventually the uke has anough of the terriable treatment and plans to run away but, before that, he goes on one last trip with the seme where the seme is attacked and losses his memory then forcing the uke to go backand take care if him where the seme. this then makes the seme very possessive of him after forgetting everything thus slowly forcing the uke leave due to guilt or somthing like that, and live with a dude who was though first introduced as the seme's old lover/childhood best friend, is now portrayed as a potential lover for the uke as he is now coping throught the "loss" of the seme.
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If anyone knows what it is it would be great if yall could say so in the replys, this has been on my mind for weeks and I cant stop thinking about it when I cant think of the name. Any help is apriciated!!! Thanks ahead of time!