During the promotions of his film, Unlocked, Siwan was interviewed by The Glass Man.
Here are the pictures from that post with some of his quotes. Here is the link to that interview.
On his character in Unlocked, 'I’m collecting some Lego for my hobby. This character was like a kid playing with his toys. When the other actors are working in their space, I leave the set to play table tennis or drink some coffee in front of the set.
I just focused on the joy of collecting.'
'I was learning a lot of things, especially from Misaeng: Incomplete Life.
I keep building up my physical strength to do bigger things in my life. To prevent weak physical strength from becoming an obstacle to succeeding in something.'
Here is the scene from Misaeng, that Siwan has mentioned in the interview.