A third theme could be self - discovery. The 'bad guy' often discovers his true self through his interactions with the 'good girl'. In 'My Love from the Star', the male lead, who has been lonely for so long, rediscovers his emotions and the value of human connection because of the female lead.
Another theme is love conquering all. Despite their differences in nature, the 'bad guy' and the 'good girl' fall in love. In 'Healer', their love grows as they face the challenges and mysteries together. Their love is strong enough to bridge the gap between their different worlds.
One common theme is redemption. The 'bad guy' often has a past or a mission that makes him seem bad, but through his relationship with the 'good girl', he is able to find a path towards redemption. For example, in 'City Hunter', the male lead's revenge mission slowly turns into a fight for justice as he gets closer to the female lead.
A third theme is the contrast between the two characters' worlds. The 'bad guy' may be from a world of wealth, power or darkness, while the 'good girl' often comes from a more simple, kind - hearted background. This contrast creates interesting storylines as they navigate their differences and ultimately find common ground. For instance, in 'The Heirs', the male lead from a wealthy and complex family background and the good - girl - type female lead from a more ordinary family situation face many challenges due to their different worlds.
There's also 'Boys Over Flowers'. Gu Jun - pyo, the leader of F4, acts like a bully at the start, which is the 'bad guy' part. However, he falls for Geum Jan - di, a strong - willed and kind - hearted girl. The drama shows how their relationship develops from his initial bad behavior towards her to a deep and loving connection.
There is also 'My Love from the Star'. The male lead is an alien who has been on Earth for a long time. He has superpowers but his aloofness might make him seem like a 'bad guy' at first. The female lead is a famous actress who is quite a good - hearted and positive 'good girl'. Their love story across different worlds and time is very interesting.
One common theme is justice. The good guy is usually fighting for what is right and fair, like in a story where a detective (the good guy) chases a criminal (the bad guy) to make sure the law is upheld. Another theme is sacrifice. Sometimes the good guy has to give up something to defeat the bad guy, for example, a hero leaving his family to go on a dangerous journey to stop an evil force. Also, redemption can be a theme. Maybe the bad guy has a chance to change in the story, but often they don't take it and the good guy has to force the situation to a conclusion.
Manipulation. Bad guys often manipulate others in the name of love. For example, they might lie to get closer to someone they desire.
Redemption is a very common theme. The bad guy realizes the error of their ways and tries to make up for their past misdeeds. Another theme is the power of love or friendship. For example, like in 'Despicable Me' where Gru's relationship with the girls changes him. Also, self - discovery is often involved. The bad guy discovers a better part of themselves that was hidden under their villainy.
One common theme is redemption. The bad boy is usually on a path of self - destruction or causing trouble, and the good girl helps him find a better way. Another theme is the power of kindness. The good girl's kind nature has the ability to break through the bad boy's tough exterior. Also, there's often a theme of transformation, where the bad boy completely changes his behavior and values due to the influence of the good girl.
Identity concealment is often seen. The male or female lead might be hiding their true identity for various reasons. This adds mystery and secrecy to the love story. In 'Healer', the male lead's double identity is a key factor in the secret love story. His real identity and his activities as 'Healer' are hidden from the female lead at first, creating a lot of twists and turns in their relationship.
Sacrifice. The 'bad guy' turned good often has to make sacrifices in the name of love. In 'Titanic', Jack, who was a bit of a scoundrel in some ways at the start, falls in love with Rose. In the end, he sacrifices his life for her, which is also a form of redemption as he goes from a carefree character to one who shows ultimate self - lessness.
Identity confusion is a common theme. When a girl turns into a guy, she has to reevaluate who she is, how she presents herself, and how society views her. Another theme is acceptance, both self - acceptance and acceptance from others like family and friends.