Why didn't Li He host KTR? Is Park Jung-soo joining the army?

Park Jung-soo is going to join the army ... He Zai has recently become famous for acting in musicals. The practice time of SS4 is too tight, so he often stays up late. Because Park Jung-soo is about to leave KTR, Yin He has to choose to go many times together, which is really helpless. Gott's itinerary was full before, and he still insisted. Now He Zai's itinerary is also full, so he should be really helpless. ...