Recommendations

Same story. Remake. Cute story. The child actor is the gem. Female actress in Korean one is cute, whereas the Chinese actress is beautiful

Under the skin and Who's the murderer have the following similarities:

The beginning is similar.
Both male leads in got to know each other because one of them lost someone important because of the other person.

One of them is a police officer while the other one also joins the police force to find the killer.

Both start to trust each other as they solve many cases together.

Both male leads are chasing after a female criminal.

Female lead goes to another "dimension", and everything starts from the beginning. Both female leads know what is going to happen and tries to change it. In Legally Romance, FL goes back in time 11 years to when she was still a college student and this time, she tries to fix her life. In the Romance of Tiger and Rose, the FL gets trapped in her script and tries to make her story stay on track. In both dramas, the female leads try to set the male leads up with the second female leads but fails to do so. Both dramas are light and funny.

Both of these are in a similar setting related to gods.

Love and redemption: Xuan Ji (Female Lead) is a naive and pure blank paper and Si Feng (Male Lead) is a person who would sacrifice himself to protect Xuan Ji.

The Destiny of White Snake: Xiao Bai (Female Lead) is a naive and curious blank paper and Zi Xuan (Male Lead) is a tsundere with a mellow personality.

Both dramas have powerful Male Leads and a naive female lead.

The male leads suffer, gets injured and are punished mostly because of the female leads.

The female leads searched for male leads once and they cry a river after the male leads' sacrifaces.

Both dramas have scenes where they go to the mortal realm because of trial. Loving friendship and about demons and humans having to deal with identity difference.

Both are about an idol and an anti-fan/stalker of his.
The interaction may differ in the two movies (the reason why the idol got approached).

They are both funny and easy to watch.

Both have undercover cops but this is slightly more romantic. This one does have a happy ending though

Based on the korean drama.
Synopsis of the korean drama:
Can you still go after your dreams without the right background?
Ko Dong Man has always dreamed of becoming famous as a taekwondo athlete but now works as a contract employee in a mundane job. His bickering longtime friend, Choi Ae Ra, aspires to become a television anchor but works instead at the information desk of a department store.
Their friends, Kim Joo Man and Baek Seol Hee have been dating for six years but face a new threat to their relationship.
Can the four friends achieve their individual dreams despite having “third-rate” qualifications?

In both shows the cast (Super Junior members) tries different genres of variety entertainment. For SJR4 has more scripted skits, STV keeps true to the genres and sticks more with the variety concept than the reality concept.

Basically the same story but different settings. We have an age gap romance where the woman is older, both couples end up working together, in both dramas one of them is the boss of the other, and many other aspects that would be a too huge of a spoiler.

Tears in Heaven and Girl in Blue are written by the same writer Fei Wo Si Cun.

Both are novel adaptions and have a resemblance of the storyline.

Stories are based on the love triangle

FL get to meet ML without realising that he is the best friend of her ex.

After a lot of twists and turns she falls in love with the ML and his consistency made her change her perception about his casanova image.

ML misjudged the FL initially and wants to teach her a lesson.

ML is social, rich and very famous. Whereas, the FL is down to earth and from a normal background.

Both the series are dramatic and have a great amount of intense scenes.

Strong chemistry among the Main leads (I think in Girl in Blue both the leads have amazing chemistry and it is even better than Xiaosu and Li Yuzheng).

Omg, totally agree!

Both the series have a lot of similarities and the background of Female lead in A business proposal, her neighbourhood, her family and friend all reminds me of Bong Soon.

In both series the Male lead always get stunned by the acts of Female lead. Her actions always leave him in surprise position. Both the Male Lead don't have mother.

ML is FL's boss and she works for him. Their scenes are super cute!

Incase you haven't seen it yet, give it a shot. You will definitely love it. ^.^

Both drama focus on a (love but not only that) story that expands from high school to adulthood. Both are nostalgic drama about youth. There are also many similarities between the mls:earnest, smart, hardworking, true to their loved ones and used to habdle everything by themselves.

From the same writer.
Heaps of beautifully written female characters
The dialogues are smooth.

Digitally in contrast:
WWW is more modern and 2521 is retro.

Age range in contrast:
WWW is about people who are seasoned and expert in their field, 2521 takes on the young and naive concept.

Nevertheless, they are both an encouragement dramas.

Nang Ai is similar to Ruk Diow Kong Jenjira because in both lakorns, the female is a young student who receives pension from a kind man with whom she will fall in love.

Fai Tang See is similar to Muaen Khon La Fark Fah because the main actor is Willie and the story takes place in a foreign country.