Kang San was shocked to know Kim Si Yeol's real identity when he saved him from the royal subordinates in "The Secret Romantic Guesthouse" episode 10.

'The Secret Romantic Guesthouse' Episode 10: Kang San Continues to Protect Yoon Dan Oh

Kang San (Ryeo Un) witnessed Yoon Dan Oh (Shin Ye Eun) claiming legitimacy for saving him in the past in front of Lee Chang (Hyun Woo). The king who was strangling Dan Oh, stopped and showed her kindness.

After arriving at the Summer Palace, Kang San was relieved that Yoon Dan Oh was safe. He confessed that he is more afraid of losing Dan Oh than dying. The landlady responded to him with kind and heart-fluttering words.

After his encounter with them, Kang San went to the palace, where he promised to bring the money back. However, he was immediately surrounded by Choi Jong Soo and his subordinates and was quick to point a knife at him.

When Choi Jong Soo was about to kill Kang San, a masked watchman appeared and killed everyone with ghostly swordsmanship. The watchman, who slowly took off his hat and mask to reveal his face was none other than Kim Si Yeol. Kang San was shocked to see him.

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Shai Collins wrote this.