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Subsequently, Kim Ji Yong begins living two entirely different lives. On weekdays, he's a model student at the police university. During the weekends, he punishes criminals who'd received light sentences and continue to commit criminal acts. Now called Vigilante, Ji Yong receives help from admirer Cho Kang Ok. Meanwhile, Detective Cho Heon chases after the man called Vigilante. (Source: AsianWiki; edited by MyDramaList)

Both are about couples who get back together after a breakup.
Both reveal intense emotions that remain deep inside through interviews.

Lee Ra El was a girl who idolized her loving parents – a highly intelligent father and a strikingly beautiful mother. But when cruel forces beyond their control cause her father’s death, her family crumbles. Embittered by this terrible experience, she vows revenge on the super-rich people who orchestrated this terrible tragedy. Her prime target is Kang Yoon Kyum, the CEO of the lucrative LY Group business empire, and one of the ringleaders of the plot that ultimately destroyed her family. Lee Ra El’s weapon of choice is divorce. By placing herself at the center of a legal battle worth a staggering USD 1.6 billion, she hopes to bring Kang Yoon Kyum and LY Group down once and for all. But in order to do so, she will need to wage a bitter legal struggle and fight powerful forces both inside and outside the courtroom. However, this plan has been in the pipelines for 13 years for Lee Ra El, who believes she will use all of her guile to catch Kang Yoon Kyum out when he least expects it. Can revenge bring her the satisfaction she craves – or will it end up consuming her?

If you like The Immortal Ascension, you might like Shui Long Yin. Both are fantasy wuxia (martial arts) dramas that centers on a male lead's spiritual and cultivation journey and heroism through the world.

If you like Fangs of Fortune, you might like Shui Long Yin.

Both are wuxia fantasy dramas featuring a strong male lead who is morally ambiguous, cold and aloof.

Both feature nuanced characters with multiple ambiguous relationships and complex motivations.

If you like Dashing Youth, you might like Shui Long Yin.

Both are wuxia (martial arts) dramas that were directed by the same director, Chen Zhou Fei.

Both feature strong leads with martial arts prowess and brash temperament.

Both have multiple emotion lines between multiple characters.

If you like Mysterious Lotus Casebook, you might like Shui Long Yin.

Both dramas are adaptations from works written by the same author, Teng PIng.

Both are wuxia (martial arts) adventure dramas featuring strong male leads with ambiguous morals and motivations.

Both have character configurations and themes that highlight martial arts prowess, honor/ chivalry, as well as teamwork, friendships, and brotherhood.

Both somewhat belong to the mystery / detective genre, although these elements may not present as the core of the story or plot.

-Both dramas captivate with their unique take on romance and ambition.

-In both shows the female leads (FL) strategically brings the male leads (ML) onto her variety show.

-The dynamic sparks chemistry and conflict in this setup creates fun and tension, helping the FL and ML grow and bringing them closer.

Both are BLs where one dude has an abusive dad.

A modern girl is in a "book"/"game"/"fake world" in a historical setting and works her way to getting out. Along the way, she struggles to leave the bonds she made and her loved ones.

Both dramas focused in the 90s

Both about women trying to make it in business.

They both start from scratch and work their way up, making mistakes along the way.

This show more focuses on the journey of one woman instead of 4.

Both have romance but still focused on the growth as women.

Their 3rd drama together, this time they are leading an ancient romcom drama.
It's lovely, funny, and their chemistry is on point as always.
Xiao Cai Mi/Debit Queen also centres in the leads being vulnerable with each other, which leads them to their closeness and love for each other.

Like Beyond Goodbye, First Love: Hatsukoi tells a story of lost love and regrets in life. Let's see how Beyond Goodbye will make us cry.

Both FLs are modern day women who time travel to the past and enter the palace, encountering the many princes there.

The two are different in some points, but also similar in others and with a similar plot:
- Ml is from some kind of special forces (Shi JIn is from the army, Ke Lei is from SWAT)
- Fl is a doctor in both
- Both end up meeting again by chance in the future (in You are my hero, FL only finds out later that she already knew him)
- Both have earthquake scenarios, rescue scenes together.