Yoo Ah In sheds tears in front of Shin Se Kyung in Six Flying Dragons.

For the recent episode 31 of Six Flying Dragons 육룡이 나르샤, Lee Bang Won (played by Yoo Ah In) and Boon Yi (played by Shin Se Kyung) were having a ball of fun throwing fresh snow at each other- a snowball fight at the snowy region.

After few runs of avoiding snowball play, they lay down on the snow feeling quite happy. Boon Yi is quite surprised Bang Won is into snowball fights. 

However Bang Won starts crying and looking sorrowful. Boon Yi is worried for his strange mood while pestering him to tell him what actually happened. 

The two were like playmates since they were kids. However since Bang Won married Min Da Kyung for the sake of politics, their friendship were kept to a distance even though he likes her a lot.

To make things worst, recently Bang Won overheard the conversation between Jeon Do Jeon (played by Kim Myung Min) and Teacher Po Eun that they are creating a new Joseon nation where the King is not able wield his power freely. The royals are forbidden from interfering in any political affairs to avoid any corruption and power struggle. The big power lies in the government ministers and people under the pyramid. 

Bang Won can't accept the fact if one day his father General Lee Seong Gye becomes a ruler, then all of his family members including himself can't interfere with political issues.
Basically a King is like a puppet with no power. Duh-duh duh! 

Come to think of it, Bang Won is left with no hope...though he respects Jeon a lot but this is something he can never accept. He tells her that it's over for them. He can no longer play or have fun with her anymore. Boon Yi was taken back by his answer.

As we can see in later episodes Bang Won starts to waver and change his mind. In history when Bang Won becomes King Taejong, he consolidates all the power under the monarchy system. He abolishes the administration by ministers in the court while eradicating those who threatens the royal authority.