The Alpha King's Witch Bride - Chapter 156: _Burning Jealousy

This is a game that surpasses dimensions.

They were born with magic, raised in chaos, and trained in sarcasm.Now the royal kids are all grown up—and the world isn’t ready.Between family feuds, resurrected villains, and a five-year-old firebender with an attitude, the palace is basically a magical daycare with crowns. But when revenge hits home and the kids take charge, things get wild, weird, and a little too flammable.Royal duties? Nah.Sibling wars? Always.Saving the kingdom? Accidental.Welcome to the most dysfunctional, dangerously magical, and absolutely hilarious royal family you’ll ever meet.

Witnessing her boyfriend cheating on her with her bestie, Shiyao was so angry that she went to a pub for fun and met a man, who was really a piece of work. After a crazy night she fled away, but was embarrassed to know that the man she slept with was her boss You Ze.
Jesus, give her a break!

- Description from Novelupdates

A man reincarnates in the body of a boy who suffered a tragedy, only to realize that he is in the world of My Hero Academia. What's even stranger is that his quirk seems to have the abilities of Nen and Haki.