Recommendations

Both Grandpa has similar behavior and spirit (did gym and ballet) anddddd [spoiler]
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Dementia[/spoiler]
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Fragmented narratives, ghost stories, memories, art as self actualisation, loneliness, forgiveness, female desire, suicide, trips abroad, affairs as beginnings, affairs as endings, toxic relationships, broken relationships, class differences, tragedy, betrayal, motherhood, bourgeois family as a trap...

Both feature swoon-worth Joseon romance between a "prince" and a palace official, strong female lead and beautiful aesthetics. We also get some gripping palace politics going on.

- Same Production Team
- Fantasy/Mystery Romance with multiple layers
- Very Good OST's (the two OST's from SOOD are to this day the best use of music in a drama I have ever seen)
- Ke Jiayan (Alice Ke) is in both (in SOOD she's the lead, in RLGL she's one of the gods)
- Both have a non-linear plot structure

MLs are Generals who love the FL dearly.
Arranged marriages.
Both they fight for the country.
TRP is deeper in conspiracies and there's a status in the identities gap.
TRP is more mature.
The couple fight side by side and develop trust and understanding
The beautiful love stories in both for ML and FL are the best

Both are "behind the scenes" one with tv production and one with the entertainment industry as a whole.

Both titles have leads that are socially withdrawn (hikikomori) that are 'forced' to take action, step outside their comfort zone and, through team work, restart their social life and personal growth.

- Two friends love the same girl
- love square
- same vibe
- one of the main character in absent for a long period

- Both of the drama starts from their childhood
- one of the main character is absent for some years
- two guys/friends love the same girl
- love square
- same vibe

Both deal with Samurai versus Ninjas! Children are raised to be demon wearing mask ninjas, but less then half survive the brutal training!

Both have samurai vs. Ninjas! Both Lone Wolf and Azumi fight against a whole army of Samurai! Do they win?

They built their chemistry by online chatting

Lady katana assassin seeks vengeance against evil clan but they hire lone wolf to stop her!..
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Lone wolf and cub face off against Yagyu shadow ninjas and beats them so the leader of the yagyu seek help from a group of lady ninjas!

Lone wolf and cub face off against a tattooed s lady assassin!,...............................,..........