Recommendations

A nice 'bad' guy played by Lee Dong Wook, who has left a group (gang vs. mercenaries) and is trying to protect himself and his love/niece (family) from revenge.
However, 'A Shop for Killers' is better produced because it contains fewer subplots. Brutal, but also sometimes something to smile about.

The girls waited years for the love of their lives to comeback. They also share a universe and belong to CH3.

Both Back for You and Shining for One Thing have time travel in their plots. But in Back for You, the male lead is the one who travels back in time. Both series feature school romance and angst, and the male lead tries to solve the mystery of the female lead’s death.

In an era when demons have dominion over cultivators and mortals, the cultivator elders believe it is imperative to send someone back in time to discover the origin of the demon lord and prevent his resurrection.

Li Su Su accepts the mission and assumes the identity of mortal Ye Xi Wu, the second daughter of General Ye. She's married to Tantai Jin, the captive prince and future demon lord, and is determined to destroy him, aware that in the future he will come to massacre many. But as witness to Tantai Jin's past life and rise to power, an unexpected tale emerges, one complicating her quest.

Bai Shuo, the youngest daughter of the Governor's mansion, made a vow to cultivate immortality to repay a favor. While on her journey to seek immortality, she encounters the powerful demon king, master of the bright moon palace, Fan Yue. Initially strangers, they gradually went from mutual distrust and manipulation to mutual affection, and eventually, both fell in love. Along with Fan Yue and the two guardians of the Bright Moon Palace, Tian Huo and Cang Shan, Bai Shuo continues her journey. Despite facing many obstacles, their friendship, love and desire are strong enough to overcome any limitations, allowing them to embrace each other truly.

"Nokdu Flower" is about the Donghak Peasant Revolution (1884-1895), which is mentioned in "Song of the Bandits". Chronologically you should watch Nokdu Flower first to understand the Japanese invasion of Korea.

Both Reset and 609 Bedtime Story feature elements of fantasy that enhance their romantic narratives. In Reset, the protagonist uses time travel to rectify past mistakes, directly influencing his relationship with his partner. Meanwhile, 609 Bedtime Story incorporates dream sequences, allowing characters to explore their emotions and deepen their connections.

Both dramas follow a similar romance + business vibe where the FL falls hard, struggles, and fights to rebuild her life while the ML supports her growth in his own way.

Both couples make you believe in their love and story. The series are similar in the heart break you will experience, but is absolutely worth it. I am convinced that no other GL couples have fought as hard as they have for their relationships.

i don't know how to explain it but Pat and Prem are giving me WanPleng energy so if you haven't seen Affair yet give it a watch and let me know if I'm right or not

Similarity
Dark/tragic tone
Villainous female lead
Takes advantage of ml's devotion
Social climbing
ML becomes the reason for her downfall
(not a spoiler it's there in the mdl synopsis)

Korean thrillers.
Both about kidnappings.
Father of the child is/becomes the main focus.
[ SPOILER ] The kids end up dying in both.

Prison setting.
Female led/driven plots.
Female leads are innocent of the crimes that sent them to prison.

Same actors, same actors same actors Same actors, same actors same actors Same actors, same actors same actors Same actors, same actors same actors

In the glitzy realm of stardom, Ryu Seon Jae shines as a top-tier celebrity, captivating the spotlight since his debut. Despite the facade of a perfect life, the demanding nature of the entertainment industry has left him utterly exhausted. Im Sol, an ardent admirer, holds an affectionate love for Ryu Seon Jae. A childhood accident derailed her dreams, yet the solace found in Ryu Seon Jae's music on the radio transformed her into an unwavering fan. The narrative takes a poignant turn when Im Sol, reeling from the breaking news of Ryu Seon Jae's tragic demise, experiences a miraculous twist of fate. Transported back 15 years into the past, she confronts Ryu Seon Jae in his 19-year-old high school self. Im Sol grapples with the formidable challenge of altering the trajectory of his future, driven by an unyielding determination to avert the impending tragedy.