I think the plan is to have Mincheol go look for her and when he finds her he immediately accuses her for essentially selling her body. I don’t think she’s gonna know that it was Taeha who put that idea in his head. And it’s probably gonna offend her - because how are you going to cheat on me and assume I’m prostituting myself? And then she’s going to see Taeha (I think he let Mincheol get a hit on him on purpose) and he’s going to play the victim card and she’s going to feel bad for him and take his side over Mincheol. Idk what else might play out tho but this is just a theory. I think Taeha is good at manipulating her to perceive him how he wants now that she’s caught feelings for him.
What good could come out of making Mincheol think they're loan sharks? Like sure make him feel guilty for a bit but then how are you going to explain that to Haesoo? Eventually Mincheol will see her with Taeha and either imply she's selling her body or just straight up ask about the loans and she'll find out Taeha made him believe he was there for money, and judging by the logic in these stories she might even believe he's there for money