Okay okay I see it. Childhood friend loves him but he assumes the opposite, check. Rich and also, apparently, objectively prettiest girl in class, check. Childhood friend gets jealous and also starts working for him, okay sure. Any form of flirting or hint that rich girl likes him will be seen by him as obligatory for the debt.
Time for 20-30 chapters of no real progression as well as a random dudes who also like the girls to make weird ass declarations and battles for the girl, as if she’s an object.