Nuh uh, I think grandpa knew it because the big snake appeared in his dream along with baby Taesun. They stopped him from going toward Taesun's parents, which means he was really close to death at that moment. I bet grandpa took it as a sign. I think he already felt that Geumryang was some kind of being... so when both Taesun and Geumryang were asleep and Geumryang was in his true form, grandpa wasn't even surprised.
Nuh uh, I think grandpa knew it because the big snake appeared in his dream along with baby Taesun. They stopped him from going toward Taesun's parents, which means he was really close to death at that moment. I bet grandpa took it as a sign. I think he already felt that Geumryang was some kind of being... so when both Taesun and Geumryang were asleep and Geumryang was in his true form, grandpa wasn't even surprised.