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Yoo Seungho's amazing at delivering his dialogues. Especially emotional, heavy scenes. I could literally feel his character's pain. Every time Dongbaek read people's memories especially those painful tragic ones, it's like he could feel the pain himself.
Seungho does it so well. His facial expressions and the way he explained to the others what he saw and feel.. and as a viewer I could relate and feel the characters' pain too. He portrayed Dongbaek well 
Dongbaek the character was traumatised since young. Imagine growing up and not remembering your past except for that one particular disturbing and scary memory of seeing a woman brutally murdered. And having to live his entire life with that.. having nightmares bc of it
On top of that he has this "gift" of being able to scan people's memories.. and the very first thing he'd see is their tragic memory. Idk to call it a gift or a curse... it could be both good and bad? Idk lol. I personally wouldn't want to read people's painful memories
