There is an arc where the mc is a father. He has a daughter. He is also boss... I think. Mc met protagonist thanks to daughter (maybe haha). Protagonist is poor and smart. If I remember correctly, protagonist is working part time. Anyway, mc proposes something to him and so mc raises daughter and protagonist together. Daughter grew up free-willed. She travels abroad, trains her body, etc. Protagonist fell in love with mc. I think mc was raising him to be his successor? I think protagonist seemed to be ungrateful (he fell in love with his step dad) and daughter wants to protect her father from him.
Tha is it!!! Thanksssss. I found the arc in that novel haha. I was really craving to read this particular arc.