In stranger we have an upright prosecutor ML who is emotionless due to a condition and a police officer FL who is strong and independent. While in connection we have an upright police officer ML who is struggling with drug issues and a reporter FL who is bold. There is no cringey romance in both but the level of understanding between the leads are just great. The vibe of the dramas are similar and you keep asking who is the culprit.

Group of people trying to uncover mysterious death of a person close to them (especially to main leads). There is a hacker in the group and illegal obtaining of evidences also. Team dynamics is great plus there is comedy also in between balancing the humor sense of drama.

Both are bromance investigation genre but one is dystopian world and other is wuxia setting. both have the perfect chemistry between male leads.

Both are wuxia drama.
Both dramas have 3 MLs who trust each other and has amazing teamwork that helps them to solve cases together.
Bromance at its best in both drama.
conspiracy theories that finally ends with a war.

Both are wuxia dramas with investigation/small case solving which will eventually lead to a bigger case/main plot of the drama.
UTP has slow burn romance with amazing chemistry between the leads (both ML and FL are strong and independent) while MLC has a slow burn bromance/friendships (lol) and ofcourse chemistry between three leads of MLC is fantastic (bickering trio)

Both drama has similar vibe, humor,action,detective skills and wonderful chemistry between leads.