"Master's Sun" How does So Ji Sub manage to get love from all the ladies despite of his indecisiveness?

So Ji Sub kisses her and then pushes her away. Could he be more indecisive? He gets jealous when he sees Gong Hyo Jin with another man. He gives Gong Hyo Jin a necklace as a present but then shows up with a fiancé and causes a bigger heartbreak.

During the 9th episode, Joo Joong Won (So Ji Sub) kisses Tae Gong Shil (Gong Hyo Jin) but his fiancé appears and Tae Gong Shil is hurt.

Before his fiancé appeared in the picture, Joo Joong Won had been by Tae Gong Shil's side to protect her whenever something happened. In the episode, Joo Joong Won goes into Tae Gong Shil's office to tell her that he does not need her help anymore. When he enters, Tae Gong Shil is sleeping uncomfortably because of a ghost. He quietly sits down next to her and pulls her to lean on him so that she can rest comfortably. He then leaves quietly before she wakes up.

Later on in the episode, a ghost takes over Tae Gong Shil's body and tells Joo Joong Won that she loves him. The ghost asks how he feels about Tae Gong Shil. Joo Joong Won kisses her right then. After the kiss, Tae Gong Shil faints. He stays by her and leaves right away when he notices that she is waking up. Tae Gong Shil does not remember anything including the kiss and the fact that he was with her the whole time.

Joo Joong Won becomes afraid of what he feels for Tae Gong Shil so he decides to ignore it and brings a fiancé into the picture. He then treats Tae Gong Shil like she is invisible.

What kind of heartaches will he cause on Tae Gong Shil in the future?