Im pretty sure TS just felt guilty about killing an innocent person. It could be that they worked together and they were just close (maybe even father-son close).
If I remember correctly, TS paid SY debts off and got him out of his abusive relationships (and into another one XD). Then told him to work somewhere safe cuz he started getting real feeling for SY and wanted him safe.
It started from chapter 4 - 6 i think (?) when those baldies (Taesung's boys) got beaten up by Sooyoung and tried to get revenge but ended up killed by Taesung bcs he's interested in Sooyoung's skill so he want him to work w him
I don't understand quite well. SY's father had to mean a lot to TS for him to be all shaken up after killing him by accident, right? Did TS feel smth for sooyoung's father? Hahaha I got all confused. I don't even remember how SY ended up working for TS, can someone remind it to me?