Both dramas have Lin Yu Shen as the main lead.
He plays a police officer in both drams.
In Undercover he plays an undercover cop who has infiltrated the drug gang.
In Master, Wait a Moment, he plays a cop who mentors a rookie cop.
Lin Yu Shen demonstrates his super fighting skills in both dramas.

Both dramas are about keeping and discovering secrets.
Both dramas deal with crushes and relationships.
Both dramas deal with school life. All About Secrets deals with high school life, while My Unicorn Girl deals with university life.

Both have Ashton Chen as the main lead and both dramas are about famous martial arts experts and how they came to be great.

Both dramas are about seeking justice for crimes. Both have wuxia and a lot of action. Both have a greater evil the heroes are fighting against.

Both Cross Fire and Detective Chinatown involve mysteries to solve. In particular the last case in Detective Chinatown (episodes 9-12) involves a mystery involving gaming which is similar to Cross Fire.

If you liked Neo Hou in Cambrian Period, you'll love him in Psych Hunter. Both dramas are full of mystery and action.

Both dramas have undercover police officers trying to break a drug dealing operation. A Journey to Meet Love also includes a love story while Breaking Dawn focuses more on a brotherly friendship.

Both dramas have our handsome Ren Jia Lun as the main lead. In Never Say Goodbye he is an undercover police officer, while in Autumn Cicada he is a Communist spy working within the Japanese military.

If you liked the police captain, Rong Yao, then you will want to see him in A Detective Housewife. He is also a police captain there. You will get to see him solve some murders.

Both are based on books written by Gu Long.
Both feature clever male leads who know the art of disguise.
Both male leads solve mysteries around them.

Both are based on books written by Gu Long.
Both have great characters with wonderful martial arts skills.
If you love action and great plot twists, then you can't miss out on Handsome Siblings.

Both stories are based in Jiang Hu.
Both have a lot of cool fight scenes.
Both have great characters and cool plot twists.