Both dramas are focused on murder case and detectives trying to solve the mystery.
Both dramas were filmed in a unique way of jumping the timeline from past to present which can be rarely seen in Chinese dramas. But both have done a great job and added spice to the dramas.
Great casting for both drama. All actors' acting are on point.
Tender Light has more romance and love story between the leads compared to Thirteen Years of Dust.

Mystery, Crime and gives off the same vibe. The murder was first shown then opens up piece by piece with flashbacks and detectives discoveries.
In both dramas, every character can be the murderer or be related to the murder and keep the audience guessing until the end.