Untold Scandal (2003)

Same source material, but here's it's actually not sanitized. Watch if you were disappointed by the drama and still want a Korean adaptation.

I recommend this both drama because , Male lead and Female lead
try to solve problem
In one drama explosion and another student murder/suicide

Both movies are based on the same novel Dangerous Liaisons by Pierre Choderlos de Laclos.

Born to a family of established court painters, seven-year-old Yun Jeong is a young girl gifted at painting. However, the pressure is on her brother to carry on the proud family tradition, as women aren't allowed to become professional painters. While her brother trains to take his place in the court, Yun Jeong helps him out by secretly painting for him. The little girl's life is turned upside down when her brother kills himself. In order to preserve the family honor, she is forced to take her brother's name and lives as a man. Yun Bok's genius and talent capture the heart of another great master of the time, Kim Hong Do.

But her daring depictions of women are condemned by the royal institute as obscene. Yun Bok meets Kang Mu and falls deeply in love. For the first time, she feels the strong desire to abandon everything she has built and simply be a woman in front of the man she loves. Kang Mu sacrifices all for his love as well. Kim Hong Do, who loved the genius of his best student, ends up loving everything about her, and Seol Hwa, a Gisaeng at the courtesan house, possesses a love for Hong Do that turns into fatal jealousy. The secret behind Shin Yun Bok's masterpiece, Portrait of a Beauty, is finally revealed after 250 years of silence.

Narita Misao is a rookie employee at a company. She doesn’t like Ichikawa Kazuya, who works in the same department. He is brutally honest when he talks to other people. Nevertheless, an incident leads to Narita Misao developing feelings for him. Ichikawa Kazuya also becomes attracted to her. The couple soon enter into an intimate relationship, but Narita Misao learns afterwards that Ichikawa Kazuya is engaged to his girlfriend. Narita Misao is confused by the situation and wonders what he is thinking.

Narita Misao is a rookie employee at a company. She doesn’t like Ichikawa Kazuya, who works in the same department. He is brutally honest when he talks to other people. Nevertheless, an incident leads to Narita Misao developing feelings for him. Ichikawa Kazuya also becomes attracted to her. The couple soon enter into an intimate relationship, but Narita Misao learns afterwards that Ichikawa Kazuya is engaged to his girlfriend. Narita Misao is confused by the situation and wonders what he is thinking.

Set in 1398. Kim Min Jae is the supreme commander of the Joseon Dynasty. He falls in love for the first time and for that woman he takes risks.
Yi Bang Won is the King’s son. He helped his father set up the Joseon Dynasty era, but he was not picked as the Crown Prince. He still holds ambitions of becoming the King one day.
Jin is Kim Min Jae’s son and the King’s son-in-law. Due to his position as the King’s son-in-law, he is unable to take part in politics and only seeks out pleasure.

playboy falls in love

Seok Won was found murdered at home. The suspect is his daughter Yoo Jin. Her mother Ja Yeong struggles to get Yoo Jin free and not guilty. The two of them live a normal everyday life but they’re both traumatized. Then one day, Ja Yeong meets Dong Ha and opens up to him.

The story will focus on a love triangle between the three leads. Eikura plays the role of Morimoto Naoko, a girl from the countryside whose first love is her uncle, Ikezawa Masato. She follows after him to Tokyo by getting admitted into an elite medical university, but there she runs into Masato's girlfriend and colleague Aya, a beautiful and intelligent researcher who is the daughter of the university hospital's director. However, things get complicated after Naoko and Masato meet again.

It also deal with the degradation people can go into when confronted with lust, jealousy and desire.

A housewife becomes enraged with jealousy over her husband's affair. Meanwhile, their son sits in the periphery, observing their violent confrontations. One evening, the housewife takes a kitchen knife into their bedroom to exact revenge on the father. The father though is able to repel her attack and throws her out of the bedroom. The mother then goes into the son's room and from there it hovers the family into tragedy.

20-year old Deok Yi’s quiet small-town life gets exciting when a former University Professor, Hak Kyu, moves in, running from the scandal of a sexual harassment allegation. He works as a literature instructor at a culture center and she works at an old amusement park. Mutual attraction leads the pair into a lusty affair, but when the fall semester begins, Hak Kyu is reinstated at the university and returns to his family in Seoul, leaving Deok Yi behind. She refuses to let the relationship die, and a confrontation between them turns tragic when Hak Kyu’s wife commits suicide. 8 years later, Hak Kyu is a popular writer, but he is barely able to see, losing his eyesight to a disease, and he's estranged from his daughter Cheong, who blames him for her mother's death. At this time, he befriends Se-Jung, a new neighbor who moves in next door. He gladly accepts her help and Cheong becomes romantically attached to her, neither realizing she is in fact Deok Yi, the woman Hak Kyu betrayed 8 years ago, now on a quest to destroy them. Her plan sets off a vengeance-fuelled chain of events that ultimately sets the three bitter, angry and desperate schemers on a twisting collision course with each other.

Oh Young is a nameless actor who dreams of becoming a big movie star. Then one day, he makes his breakthrough with a film and becomes a star overnight. He discovers a new hidden world of fame, power, and pleasure, but inevitably all things have a dark side, which puts everyone around him in danger.

I recommend this both drama because , Male lead and Female lead
try to solve problem
In one drama explosion and another student murder/suicide