

Rather than marry Yonkai, Yujung and Hangwon fled into the desert, but they were eventually found. When his sister and Hangwon disappeared, the villagers and his parents refused to tell him where they went or why they fled, but Lusung was determined to find his sister. He mentions in his diary that he didn't trust the Colonel and that ever since his visit, his parents would speak in hushed tones and his sister appeared to no longer be happy, even when talking about the wedding. Lusung at the time was very young and was confused as to what was happening. He immediately demanded that they give the beautiful Yujung to him. The Stratus Empire had just assigned Colonel Yonkai to the Cinderlands region and he came to visit Sandstone Refuge. Lusung adored his older sister and gave her a special mirror as an engagement present. Yujung was planning on marrying her long time lover and neighbor, Hangwon, and was overjoyed in her preparation for the wedding. Young Lusung giving his older sister his wedding gift.

However, Dokdan mentions that he sensed some darkness within Lusung even before Colonel Yonkai murdered his family. Lusung used to live with his mother, father, and older sister, Yujung in Sandstone Refuge and lived a relatively happy life.

In Act II, Chapter 11, the source of Lusung's treachery is revealed. He revealed that he had been working alongside Jinsoyun to steal the Twilight's Edge from Master Hong, secretly poisoning Master Hong to weaken him. Lusung was a former student of the Hongmoon School who betrayed Master Hong in order to steal the secret Hongmoon techniques.
