Ahmm guys.. I need your help ╥﹏╥ I'm searching for this yaoi manga.. The uke is old...

Ahmm guys.. I need your help ╥﹏╥ I'm searching for this yaoi manga.. The uke is older than the seme then when the seme's parent's died, the uke became his guardian. The uke was seme's father's student before and he was so wild but then, the seme accidentally read the love letter for his father and it was from uke. Sorry if the explanation is too complicated.. Thank you in advance! C: