If you mean Taesung when you said "Daddy" then yes he killed sooyoong's Uncle. I forgot what chapter it is, but the girl who visited on Taesung's office said that, before Taesung had this habit of beating up those who owed his Father.... So I came up with a theory that maybe sooyoong's uncle owed Taesung's father and failed to give back the money and so Taesung beat up the Uncle and accidentally Killed him... Yes, Accidentally because he still visit sooyoong's uncle and there's a scene when Taesung is crying maybe because he killed sooyoong's uncle.
Omg that's not good Thank you Now I understand everything <3
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Wait a second I don't understand did the daddy kill the uncle???? And he hide it ??? Ahhhh I don't understand what's happening