Hotel del Luna

Spoiler warning: the moments below are drawn from across the whole series.

• Episode 4: Man-wol kisses Chan-sung to keep him silent while a dangerous ghost is nearby.
• Episode 6: Chan-sung gives Man-wol an old autograph, and she reflects that the ocean she's looking at now is more beautiful than the one she remembers.
• Episode 9: Chan-sung throws away the medication that stops him from seeing ghosts, choosing to stay at Man-wol's side despite the danger.
• Episode 10: after Man-wol admits her fear of disappearing, Chan-sung reassures her that he won't let that happen, and the hotel's ancient tree blooms.
• Episode 16: Man-wol crosses the Bukhan River railroad bridge at dawn to begin her journey to the afterlife.

• Mokpo Modern History Museum No. 1 (Mokpo, South Jeolla Province), the Renaissance-style former Japanese consulate building used for Hotel del Luna's exterior entrance.
• Hotel Seine, Ikseon-dong, Seoul, used for a 1980s-set flashback scene in episode 11.
• Paradise City, Incheon, its interior doubled as the rival "Royal Pacific Hotel" and its indoor amusement park "Wonderbox" in episodes 1, 2 and 8.
• Buyeo Garimseong Fortress, the site's centuries-old zelkova tree was used for the dream and reunion sequences in episodes 3–5.
• Forest of Wisdom, Paju Book City, the library where Yu-na meets Chan-sung in the final episode.
• Bukhangang Railroad Bridge, the bridge Man-wol crosses at dawn as she begins her journey to the afterlife in episode 16.

Writers Hong Jung-eun and Hong Mi-ran built the show's look around a hotel that exists only for ghosts settling unfinished business. Hong Jung-eun said improved production conditions meant they could finally realize a full fantasy setting: "we decided to go with fantasy, because what we technically couldn't do in the past was possible now." Hong Mi-ran described the deliberate contrast in how the lead is presented: Jang Man-wol "looks fancy and lush, but when she's alone she looks bitter", a tension the show carries visually between her ornate, jewel-toned looks in the lobby and the quieter, worn-down version of her seen in private.

• Letting go of regret: Jang Man-wol has been bound to the hotel for centuries by guilt over her own death; her arc is about becoming ready to move on rather than waiting to be forgiven by someone else.
• Grief as unfinished business: the hotel's guests are ghosts each held back by one unresolved matter, and the show works through that idea guest by guest.
• The gap between how someone appears and how they feel: co-writer Hong Mi-ran described Man-wol as someone who "looks fancy and lush" in public but "bitter" when alone, a contrast the series returns to throughout the season.

• The series was written by the Hong sisters (Hong Jung-eun and Hong Mi-ran), who had used a single hotel-set episode in an earlier drama, Master's Sun, before building an entire show around the idea.
• Its finale posted a 12.001% nationwide rating (AGB Nielsen), among the highest ratings a tvN drama had recorded up to that point in 2019.
• The soundtrack included Taeyeon's "All About You" and Heize's "Can You See My Heart?"; Taeyeon's track won the OST Award at the 2020 Seoul Music Awards, with Heize's nominated in the same category.
• Lee Do-hyun, who plays the young Go Chung-myeong in flashbacks, was in one of his earliest credited roles here before later leads such as The Glory.
• Actors Lee Joon-gi (episode 3) and Kim Soo-hyun (episode 16) both made brief cameo appearances, and P.O of Block B played hotel staffer Ji Hyun-joong for the full run.

IU (Lee Ji-eun) and Yeo Jin-goo have never confirmed a romantic relationship, on set or off. In a joint interview with Marie Claire Korea, both said they were initially worried about connecting quickly because of their shy personalities, but became close friends faster than expected, close enough that they said they no longer had to consciously work at building chemistry on camera. Coverage of the two has consistently described a working friendship, not a romance.