"Master's Sun" Seo In Guk is unable to hide his disappointment.

August 28, an episode of the SBS drama "Master's Sun" featured Kang Woo (Seo In Guk) looking very disappointed after seeing Joo Joong Won (So Ji Sub) and Tae Gong Shil (Gong Hyo Jin) looking happy spending time together.

When Tae Yi Ryung (Kim Yoo Ri) approaches Kang Woo while he is keeping watch on Joo Joong Won. She asks Kang Woo if he's keeping an eye on them but he replies, "I'm being jealous right now. Watching the woman you're interested walk out with another man is called being jealous."

Later, when Kang Woo sees Tae Gong Shil frustrated about her missing doll, he promises her that he will buy her a different doll. Soon after, he finds a doll that he names after Gong Shil and secretly places it inside of her drawer.

Joo Joong Won takes Gong Shil to the hospital because he is worried about the scar on her forehead. When Kang Woo sees Tae Gong Shil with Joo Joong Won, he becomes extremely down.

Kang Woo takes back the surprise doll he prepared for Gon Shil then returns to being the cold watchman following around Joo Joong Won.