Agent from Above

both taiwanese drama with super natural element. Agent from Above centered around one main plot while ONHCT has new case for each episode with a main overarching theme. Agent from Above leans slightly more on comedic side, but ONCHT also has its heartwamning funny moment. Both are lovely TW drama with TW style humor

They both deal with demons and a main character tasked with protecting the world from evil. They are given abilities from a higher power to fight those evil spirits. There are elements of found family, loss, perserverance and doing things for the greater good

They are very similar: ML who can transform into a spirit and traverse the spectral realm. They are resolving supernatural disturbances in the human world

Both deal with similar folklores of good vs. evil, gods and demons.
Both have a lot of bromance moments and humour.
Both have good action scenes with lots of great CGI.

Though the plots are quite different, the special effects are top tier in both dramas. The monster parade is high-definition, diverse and entertaining. Both dramas also use an innocent-hero type of ML.

AFA is more supernatural and mythology-linked, SH is true horror with a scifi bent.

Both dramas include ghosts, demons & deities. Handsome ML's fight evil demons along with a FL. The Devil Punisher does have romance as a major story arc whereas Agent from Above does not.

Agent from Above has a similar story line - good vs evil, raising evil from dead etc. however, Agent from Above managed to give a level of entertainment that Twelve didn’t got near to, despite the budget and actors.

ML in Agent from Above and FL in Haunted House Secrets take orders from the immortal world and resolve the supernatural occurrence in the mortal world. And both dramas have the same actress as the lead.