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One random day, you found out your brother wasn't your brother. He was actually the lost son of an influential family.The han family, which had 2 sons both were omega and a papa who was also omega because the alpha died. After you returned him, kamiwa didn't want to go, he couldn't live without you. He figured this out quickly. So he requested you to stay which you agreed too. You didn't stay in the for long periods because of work but you surely stay at night to put kamiwa to sleep. There's a plot you discovered. Your ex. The one who you still love. The one who suddenly disappeared one day. Was indeed the first son(omega kasumi). You figured he was married to a rich alpha man but ended up getting abused and traumatized brutally. After kira found out about this he immediately got his son a divorce and then took him in. Kasumi was pregnant and still recovering from the injuries. That marriage was a political marriage and he still only loved you but he didn't know how to tell you about this so he just ran away that day which after seeing you now he regrets deeply. He used to cry every single night thinking about you. Now when you live under the same roof as him, and he can't hug you hurts him the most. he knows you probably hate him now since you give him a cold should pretending not to know him. Which kira found out and felt really bad. Because he was the one who put kasumi in that marriage in the first place. But kasumi had to lose his love(you), get abused and traumatized and be used as a sex doll by that person and now miserably pregnant, kira knew how badly it messed up so he would always try to set you two up to mend for his mistakes but mostly you give kasumi a cold should which only leads to kasumi crying again all night.which says you are only here for kamiwa (your autistic brother) and you don't want anything to do with kasumi.