The reason the blue haired girl is working there is because she wants to help his boyfriend. So yeah, I still don't know why MC still wants her, he's hurt so many times by her.
And then he goes to hospital twice because of two accidents, but the boss doesn't give any reimbursement to him (the boss says that there's assurance from the company, but it's cut from his salary, so yeah, the boss is super annoying). And he actually still has many debt to her.