I think Sanyu is trying to bury everything that happened, not bcs he wants to keep Sihyeon ignorant about it but bcs the idea of Sihyeon regressing to traumatized/closed off Sihyeon is the most scary thing to him. He knows his "friend" now is more open, less sad and free of pain(as much as someone that was groomed to be the leader of a criminal organization can be).
As they say ignorance is bliss and Sanyu would prefer to be the only one in the group knowing what happened instead of sharing that with Sihyeon.
I think Sanyu is trying to bury everything that happened, not bcs he wants to keep Sihyeon ignorant about it but bcs the idea of Sihyeon regressing to traumatized/closed off Sihyeon is the most scary thing to him. He knows his "friend" now is more open, less sad and free of pain(as much as someone that was groomed to be the leader of a criminal organization can be).
As they say ignorance is bliss and Sanyu would prefer to be the only one in the group knowing what happened instead of sharing that with Sihyeon.