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As a member of Bi Yeong Pal Mu, Baek Sa is loyal to King Jin Won, taking his duty of protecting the king rigorously. As the king's personal guard who succeeded Baek Ryung, he follows the king with utmost caution and austerity from behind the shadows. However, one notable trait he exhibits as the king's personal guard is his usual visibility when accompanying Won during his excursions. He is also obedient to the king, but he opts to act at once in cases of emergency regardless of the king's orders. Jin Won also once remarked to himself that Baek Sa is quite perceptive, causing Won to fail in escaping the guard's presence.
Rebel Army Suppression: Setting in Motion Edit
Following King Jin Won's incident at Moon's End Village that almost cost him his life, Baek Sa is assigned to guard the king per Heuk Rang's strict orders. As Won heads to Yoo Dan Ah's residence to check on her condition, Baek Sa, Baek Lin, and Baek Ju follow the king quite visibly, much to Won's annoyance.
As Baek Ju remarks how she does not want to end up killed like Baek Ryung, Baek Lin immediately shuts her mouth. Baek Sa apologizes to Won for their inconvenience, but asks the king to bear with them for his own safety. Won then orders them to follow him from the shadows, which they do, as Baek Lin reprimands Baek Ju and hits her on the head.
At night, Baek Sa ends up following the king and Dan Ah to Bi Hwa Rim, specifically by Hwa Gwi Cheon. The two later encounter Hong, and Baek Sa, from the shadows, sees the trio's unusual combination. He understands about Jin Won and the chief state councilor's daughter together, but seeing them with a painter fuels his suspicions, wondering why Baek Ryung did not report any incident of the three together.
Rebel Army Suppression: Execution Edit
While the Royal Army prepares for its mobilization in eradicating the rebel forces, Baek Sa personally guards Jin Won. The king misleads his servants and guard with taking a bath at the bathhouse, actually using the instance to escape them to meet with Dan Ah for the supposed elopement. Outside, Baek Sa notices the head servant grow worrisome and fidget out of panic, thinking how suspiciously long it is taking the king to stay at the bathhouse. Baek Sa reasons out that the king is not to be disturbed upon his orders, but the head servant insists that she has urgent news about Hyun Bin. Hence, Baek Sa excuses himself and enters the bathhouse, only to find it empty.
Jin Won almost reaches the palace gates, but Baek Sa and the head servant quickly find him. Relieved to have found him, Baek Sa reminds the king not to leave the palace premises unaccompanied. The head servant then informs Jin Won of Hyun Bin's childbirth. After the simultaneous ambushes on Bi Hwa Rim and Yu Hyang Ru, Baek Sa accompanies Jin Won as the king personally visits the prison filled with arrested rebels.
Bridal Selection Arc Edit
Baek Sa accompanies Jin Won to the ruins of Yu Hyang Ru. The king orders him to buy the best kind of liquor, and the guard soon returns with it. Won pours the liquor to the ground, mourning for his beloved, and drinks some liquor himself. He silently weeps, after which he orders Baek Sa to have the assigned people stop updating the gisaeng registers from then on.
As the sun sets, Baek Sa advises Jin Won to return to the palace, preferrably with haste to arrive at the palace banquet on time. The king asks him whether the price at the gallery has changed, but his guard informs him that the price remains unchanged. Jin Won struggles to stand out of intoxication, so Baek Sa asks the king to lean on him. The latter merely states that everything he has done is futile, much to Baek Sa's confusion.
They then arrive back at the palace by nighttime, just in time for the banquet. During a shadow dance performance by an emissary brought by Crown Prince Jang Rok Ha of Seo Seo, Jin Won later collapses after approaching her, after which the banquet is stopped. Baek Sa, along with the palace servants and guards, rushes to the king's aid, ordering for the royal physician. The next day, Baek Sa strolls with Jin Won to Dan Ah's bridal quarters despite the servants' protests due to a custom not allowing the king to see his bridal candidates before the royal wedding.
- His name in Hanja means "white snake" (白蛇). Like the other members of Bi Yeong Pal Mu, his alias was formed out of an adjectival color and a noun.
|Characters of Twelve Nights|
|Royal Family||Ahn Young • Hyun Bin • Jin Hyul • Jin Jeok • Jin Won • Unnamed Baby Prince • Unnamed Baby Princess • Yi Hwi • Yi Sae Gi • Yoon Yeon Lee|
|Ministers||Hwang Se Hyung • Kim Hak Gyu • Sa Hwa Hyeon • Seo In Seon Woo • Wi Ji Hyun • Yi Ha • Yoo Ja Gyeom|
|Bi Yeong Pal Mu||Baek Ah • Baek Ju • Baek Lin • Baek Ryung • Baek Sa • Heuk Rang|
|Bi Yeong Ship Mu||Baek Ho • Baek Yoo Shin • Gil Mu Jin • Yi Ha|
|Deung Ha Bul Myung||Baek Ho • Crimson Moon • Gil Mu Jin • Nabi • Seol Hwa • Seo In Seon Woo • Wol Young Hwa • Yi Hwi • Yi Jeok|
|Yu Hyang Ru||Nabi • Wol Young Hwa • Yi Jeok|
|Others||Chung • Hwang Se Ryeon • Hyun • Ma Mi Song • Nam Yang Heon • Sori • Woon • Yi Ha's Wife • Yoo Dan Ah • Yoo Dan Ah's Mother|
|Royal Family||First Prince • First Princess • Jang Rei • Jang Rok Ha • Jang Ryun • Second Princess • Three Wives of Jang Ryun • Unnamed Baby Prince • Unnamed Baby Princess • Yeong Bi|
|Others||Gwak Ji Ryeon • Meng Gyeom|