Soldier S01E23 - Episode 23

Hapha, pressured by the ministers, decides to surrender to avoid an attack on the capital city. Once Kim Joon is back, Hapha makes him his assistant. Emissaries are sent to the Gwiju and Jaju fortresses to convince the generals defending it to surrender. At first both fortresses refused, but Gwiju after receiving a second visit from a member of the royal family raised the white flag to protect the king.