I personally strongly doubt so.
She's been shown to be annoyed that Taeju is less present and focused at work lately, but that's not new, and she has nothing to gain by doing this. Especially since it could bring police attention to her family's business and since she knows Taeju'll be pissed and very much "distracted" from his work to say the least.
It is 99% sure to be the two runaway guys (the one Euihyun sent to the hospital in chapter 1 and who attacked and hurt Euihyun, and the alpha dad), possibly in alliance with a rival gang.
jk, i was just blaming her because i was annoyed. though i hope he'll be found sooner
it's the alpha girls fault for triggering him! i think she's also behind that kidnapping