He wouldnt tell him because he lost that little faith, he was threatened so of course he wasnt going to tell him. Sure Seungho has power but he wouldnt be in that situation if he want kidnaped in the first place. As a result he believes if he tells them he would be killed.
THE AUTHOR KNOWS HOW TO KEEP US ON EDGE!! fr tho seungho better kneel and apologizenfo our bb. poor nakyum