@CS She's concerned not about herself only, she's in charge of the whole firm and all people working for her. The lawyers profit depends on their clients, the powerful chaebol family can damage Doguk easily, because that family is their own client, and many other corporate clients of Doguk are the people from the same social circle. In terms of business, the young associate isn't worthy enough to risk so much. It's just Yunshin is MC, he's cute and genuine, and we like him a lot, that's why people judge her decision and even curse at her, but if to look at the situation objectively - firing him is the easiest way for Ms. Song and Doguk to not be involved into that chaebol's family mess. But she can't afford to lose Seheon, and he's gonna use it against her, so Yunshin is gonna be ok.