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Ma Kyoem is from Not To Die (by the same author??) where he went batshit insane after being severely bullied and murdered all 7 of his bullies in cold blood.
He is the trigger for the MC of NTD, Yim Dajun, a soft bullied boy who gets expelled and joins a gang, after he gets inspired by Ma Kyoem and pushes one his bullies in front of a truck.
https://flamescans.org/series/to-not-die/
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Ohhhh I see.. I thought he is a real serial killer.. If Han Yeri will not be able to save early she will be like that.. Also the guy they consistently bully earlier he may also be like Ma Kyeom.. well if Im in his situation bullying is a twice suffering because it contains physical and mental abused.. so going insane from being bullied was not a surprised.. and psychological treatment is much harder..
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Re-read again because of the upload gaffe, and I'd forgotten how much I HATED Ukie. It seems like the author did try to rival but got chicken feet at the last moment and turned her into Waki's secret mother. She has the all the qualities of a typical female rival - annoying, bitchy, jealous etc etc - but it's worse because she is the mother of the ML.
Potato on a leash and overprotective Mama-wolf hehehe