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They might lose a big ally but holding on to Sehun with his reputation and skills in media would be a better long-term investment. He's skilled enough alone that he can go to any law firm so no wonder why he can be so arrogant XD at least he can back up his talk.
Doing all this for Yoonshin's sister coz he knows how important she is to him. With his previous attitude, it would've been easy to fire Yoonshin coz he didn't like the nepotism so you gotta admire Yoonshin's perseverance to pursue Mr. Kang that Sehun had no choice but to risk it all XD