I feel like Professor's main target is Jiheon. Becoj when The Professor's was introduced for the first time in S1, He had a photograph with him of Jiheon and Wooju in which he was looking only at Jiheon, instead of Wooju. It's either Jiheon is Professor's sibling, or he's interested in Jiheon (in a romantic way), instead of Wooju. It's as if, Wooju is only the source to reach for Jiheon that's why Professor's using Wooju to get to Jiheon.
I feel like Professor's main target is Jiheon. Becoj when The Professor's was introduced for the first time in S1, He had a photograph with him of Jiheon and Wooju in which he was looking only at Jiheon, instead of Wooju. It's either Jiheon is Professor's sibling, or he's interested in Jiheon (in a romantic way), instead of Wooju. It's as if, Wooju is only the source to reach for Jiheon that's why Professor's using Wooju to get to Jiheon.