beta
So the yuuma (omega) left the seme suddenly and left everything behind. Yuuya seeing yuuma even left their newborn baby behind decided to become yuuma and said it to seme. Like in the flashback we see yuuya always liked seme, and based on yuuya's monologue because him and seme are both alpha while yuuma is omega seme are bound to be with yuuma. Up until chp 4 the relationship wasn't progressing much they do kiss and it's obv right now seme like yuuya. Also the ending of chp 4 the investigator found yuuma