This drama is a mixed bag. It's a light-hearted watch with a blend of comedy, romance, and supernatural elements. The story follows a cynical college student who can see ghosts and a cheerful ghost who has amnesia. Together, they help other ghosts move on while searching for the ghost's missing memories.

Here's what worked for me:
Fun and heartwarming moments: The show has a good balance of humour and heartwarming scenes. The ghost-busting duo is entertaining, and the side characters add their own charm.
Intriguing mystery: The amnesia plot keeps things interesting, and there's a larger mystery that unfolds as the story progresses.
Beautiful love story (kind of): The romance between the lead characters is sweet, but I found it lacking in depth.

Here's what didn't work for me:
Uneven pacing: The first half focuses more on comedy and episodic ghost stories, while the second half dives deeper into the mystery.
Logic gaps: The supernatural elements can get a bit silly at times, and there are some inconsistencies in the plot.
Acting: I wasn't a big fan of Taecyeon's acting here. I know he's supposed to be a great actor and this is one of his old works obviously but he wasn't so great here. I guess he improved over the years. Good for him.

Overall:
Let's Fight Ghost! is a fun and entertaining drama with a good dose of heart. If you're looking for something light and engaging with a touch of romance and mystery, this show is worth checking out. However, if you prefer dramas with a tighter plot and more complex characters, you might want to look elsewhere.