18 vs. 29 (2005)

They both contain that fluffy and cute romance between the characters. I thought both match each other well.

Both lead couples' jobs are the same in both dramas .. also both dramas have similarities in the plot .. it feels the same..

Exact same plot line, only GBC is centred around both leads and this is about the female lead. Second chances are everything! GBC is the superior drama though.

In both series after an accident the main girl believes she's a high school student.
Also her main interest tries to make her regain her memories.

- Both dramas are about married couples who are going through a divorce.
- Both dramas are about one lead becoming younger version. But in 18 again the ML really transformed to a younger by the fantasy element, but in 18 Vs 29 FL lost all the memories of her adulthood because of an accident and become younger in her mind.
- Both focus on finding lost love and second chance romance.

Lee Gun used to be a promising tennis player, but he was injured. After that, he lost all of his self-esteem, and his life completely changed. With the use of a memory eraser, his memory is erased, and he is reborn with maximum self-esteem and presence. His first manipulated love is Kyung Ju Yeon, a psychiatrist at the brain research center. Other people around him include his younger brother Lee Sin, who is ranked the world’s no.1 ranked tennis player. Meanwhile, Jeon Sae Yan is Lee Sin’s translator.

Same main plot Idea , In both the female lead has amnesia , ending losing the past 10 years of her life , including her husband and how she fill in love with him , and the journey in order to rediscover the lost love .

Eun Soo is a pure but unsophisticated woman who runs a small resort inn with her father. Eun Soo is just an ordinary girl, but her life changes when she meets a man who's completely lost his memory. She takes him in and cares for him, and even gives him a name: "Baek Chang Ho". Love blossoms, and soon wedding bells can be heard.
But on the night of their wedding ceremony, Eun Soo's father passes away. And soon after, Chang Ho disappears too! In the blink of an eye, the two people Eun Soo loves most in the world have left her. But Chang Ho had his reasons for disappearing: his real name is Kang Hyun Woo, and he's heir to a large conglomerate. Even more, someone is plotting to kill him

main couples in both dramas start their love story anew after marriage and the female lead in each is an uneducated simple woman fighting against a sophisticated rival and her own insecurities to win the heart of the gorgeous husband.

Similiarity:
- Both female lead has mentality of teenager due an accident.
- Both female lead has a teenager crush on them.
- The main lead are lovable! (ofc)

Even tho it has different kind of plot, but both are interesting to watch

A love story about a woman who falls in love with a man suffering from a split personality disorder, and the troubles she goes through because of this love. Aizawa Saki, who works for a trading company, was having an affair with her department chief, Okada, but decided she wanted to put an end to the relationship. On her way home after telling Okada it is over, Saki is surrounded by a gang of young boys. Luckily, Takagawa Ryo, a man with a piercing glance who happened to be there, rescues her, then steals some money from her wallet and walks away. The next day, a new employee, Mizuno Takumi, reminds her of him. Saki thinks that it can’t be the same man.

In both series an accident causes the main actress to lose her memory about some years of her life.

Similar storyline. Female leads lose memory, husband's face challenge of getting their wives to remember & fall in love with them again.