TV series
"X" Marks Her Next Victim.
Behind a beautiful face hides a cruel nature—Baek Ah-jin, who sees through and manipulates others' hearts. After stepping on the sacrifices of many to reach the top, everything begins to change the moment she arrives there. A woman wearing a mask to escape hell and climb to the highest place. And the story of the Xs being brutally crushed by her.
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Checked Jul 22, 2026
Behind a beautiful face hides a cruel nature—Baek Ah-jin, who sees through and manipulates others' hearts. After stepping on the sacrifices of many to reach the top, everything begins to change the moment she arrives there. A woman wearing a mask to escape hell and climb to the highest place. And the story of the Xs being brutally crushed by her.
Cast, crew and production details
Kim You-jungBaek Ah-jin
Kim Young-daeYoon Joon-seo
Kim Do-hoonKim Jae-oh
Lee Yul-eumLim Le-na
Bae Soo-binBaek Seon-gyu
Lee Seo-anLim Sun-ye
Gi So-youChild Baek Ah-jin
TVINGSouth Korea
Monster UnionSouth Korea
Studio DragonSouth KoreaWatch options above are for the show and may vary by season or episode.
Episode 1
When Sung-hee attempts to expose Ah-jin's secrets, she strikes back with the help of fellow classmates.
Guest stars Hyeon Jin, Bae Soo-bin, Lee Seo-an, Gi So-you, Kang Ian, Kim Yi-kyeong, Yoon Joo, Kwon Su-yeon
Where to watch Dear X
Episode 2
Ah-jin is accepted into her dream law school, but her dreams are crushed when her father returns.
Guest stars Bae Soo-bin, Lee Seo-an, Gi So-you, Kang Ian, Kim Yi-kyeong, Kim Ji-hoon, Kim Ji-young, Hong Bi-ra
Where to watch Dear X
Episode 3
With her dream shattered, Ah-jin begins to work at a cafe and secretly schemes to manipulate Jung-ho.
Guest stars Bae Soo-bin, Kim Ji-hoon, Baek Sun-ho, Kim Ji-young, Hong Bi-ra, Jeon Kuk-hwan, Lee Seung-jin, Kim Sang-il
Where to watch Dear X
Episode 4
As suspicions fall on Ah-jin with nowhere to turn, she is approached by Mi-ri, who steps in to save her.
Guest stars Kim Ji-hoon, Hyun Seo-ha, Kim Ji-young, Shin Mun-sung, Hong Bi-ra, Kim Se-yoon, Kim Yu-mi, Kim Jae-il
Where to watch Dear X
Episode 5
Ah-jin makes her debut as an actress and grows increasingly wary of Lena.
Guest stars Hwang In-youp, Hyun Seo-ha, Kim Ji-young, Shin Mun-sung, Hong Bi-ra, Jeon Kuk-hwan, Choi Sol-hee, Kim Il-woo
Where to watch Dear X
Episode 6
Determined to advance her career, Ah-jin sets her sights on top star, Heo In-gang.
Guest stars Hwang In-youp, Park Seoung-tae, Hyun Seo-ha, Kim Ji-young, Shin Mun-sung, Hong Bi-ra, Ryu Kyeong-hwan, Yoon Hyun-soo
Where to watch Dear X
Episode 7
Ah-jin's year-long romance with In-gang deepens, but her past is at risk of being exposed.
Guest stars Kim Yi-kyeong, Kim Ji-hoon, Hwang In-youp, Park Seoung-tae, Hyun Seo-ha, Kim Ji-young, Hong Bi-ra, Jeon Kuk-hwan
Where to watch Dear X
Episode 8
After his grandmother's passing, In-gang proposes, but Ah-jin ends their relationship instead.
Guest stars Kim Yi-kyeong, Kim Ji-hoon, Hwang In-youp, Park Seoung-tae, Jung Woo, Kim Ji-young, Hong Bi-ra, Ryu Kyeong-hwan
Where to watch Dear X
Episode 9
As Ah-jin faces public backlash for her break up with In-gang, a wealthy savior comes to her rescue.
Guest stars Kim Yi-kyeong, Kim Ji-young, Hong Bi-ra, Ryu Kyeong-hwan, Hong Jong-hyun, Son Kang-gook, Kim Il-woo, Kim Yu-mi
Where to watch Dear X
Episode 10
Jun-seo learns the secret of his birth and leaves Ah-jin’s side while she marries Do-hyuk.
Guest stars Kim Yi-kyeong, Hong Jong-hyun, Son Kang-gook, Kim Il-woo, Kim Yu-mi, Go Seo-hee, Park Bu-keon, Yeo Dae-hyun
Where to watch Dear X
Episode 11
Ah-jin discovers the unnerving truth about her husband. Desperate to break free, she turns to Jae-oh.
Guest stars Bae Soo-bin, Kim Yi-kyeong, Ryu Kyeong-hwan, Hong Jong-hyun, Son Kang-gook, Kim Yu-mi, Kim Min-song, Kim Nam-hee
Where to watch Dear X
Episode 12
Ah-jin’s deepest darkest secrets are revealed just as she rises to the very top.
Guest stars Kang Ian, Kim Yi-kyeong, Hong Jong-hyun, Lee Woong-jae, Son Kang-gook, Kim Yu-mi, Kim Min-song, Park Seung-wan
Where to watch Dear XEpisode information updated Jul 22, 2026
