Both are fantasy dramas and both ML has a similar background. ML and FL have a significantly big age gap in both dramas.

Scent of Time and Perfect Marriage Revenge both involve a situation where both FLs start disliking the man they've been in love with for a long time due to a life-and-death situation. Also, they both start having feelings for a different man at the end.

Ditto 2022 is based on Ditto 2000, plotwise both are very similar. Even though there are some differences in character dynamics, both are basically the same.

Both dramas center on detectives and the murder cases they have to solve. In signal detectives try to solve a serial killer murder case like in blind.

Both are dramas that focus on solving murders/revenge etc. Some scenes in beyond evil reminded me of blind

Both MLs work hard in order to gain and master powers to par up with the world and people around them.

Both drama are from the same writers - Hong sisters. Both dramas are fantasy dramas . Even though plot wise it's different some character dynamics between the characters are similar. While a Korean odyssey storyline is set in the modern time, alchemy of souls is set in a different period of time.

ML in both dramas have to reconsider dating FL because of a past involvement with a family member and other tragic circumstances around it.

Same female lead .Also both are fantasy dramas. Plotwise it's different but have some similarities .