MeiLandi

Both stories have quite the similar beginnings.
FLs from both dramas got amnesia after being rescue by MLs.
MLs lies and fabricated a relationship with the FLs.
While they stay by ML's side, they will discover many secrets as well as uncover their own identity.

Both are sweet, lighthearted romance

Both MLs have mysterious identities whom FLs had admired for a long time that they won't find out until later

Peaceful, warm and beautiful cinematography set mainly in Spring/Summer

No annoying third wheels

Only setbacks are main leads' personal struggles

Main leads emotionally heal each other scars

Both sweet romantic stories are about FLs who are hardcore fans of famous authors that turn out to be the MLs.

MLs falls in love with FLs first without the other knowing their real identity.

Mr. Honesty and City of Romance is probably one of the most similar on the list of recommendations.

Key similarities are that Both MLs hates lies and did not liked FLs at first but are attracted to the FLs despite their oftentimes kind and well-intentioned lies

Romantic attractions starts as soon as both FL and ML met.

Love at first sights. MLs started pursuing FLs.

Sweet, fluffy romance with no real obstacles

Both MLs are doctors and met FLs while treating someone and/or being treated.

Develop mutual attractions and gets closer to each other through day-to-day interactions...

Both have this feel good, euphoria type of romance with no major villains except their own pasts or mental barriers

*Both dramas' theme songs were sung by singer, Utada Hikaru.

Both dramas are stories of first loves and have a solemn melodrama vibe set mainly in fall/winter.

Depicts how two people with dark, unhappy pasts reconnect and heal each other through love.

FL and ML both are well known figures/ professionals in their field of careers when they first met and became attracted to each other.
Both MLs suffer from severe mental/psychological illnesses.
As they fall deeper in love with each other, they open up more about their feelings and past traumas.
Both romance drama depicts the process of healing and acceptance.

Both couples dated and separated during their younger, teenage years then reunited many years later after they had already established their respective careers. They proceed to rekindle their love and resolve their past misunderstandings and maturely face obstacles that comes their way. Both are contemporary winter-themed, romance dramas with the small difference of Love Song in Winter being a little gear toward the suspense/mystery side.

While LLTG does not have an enemy-to-lover trope like LoN, but everything else is almost the same.

-Both ML had to take on different identities (or disguises) growing up in the imperial court in order to investigate the truth about their past family's murder/injustices
-Both ML are screwed and scheming minister/military positions
-Both ML lies and manipulates the FL in their plots and quest for revenge

-Both FL are normal but very smart, witty girls who yearns for a carefree life with freedom.
-Both FL are their own character and person and has a very clear understanding of priority between love, family and responsibility. Meaning they don't go crazy over guys, are rational thinkers, strong and independent.

-Both dramas are slow burn romance
-Theres about a 10 years age gap between ML and FL in both dramas. Both FL are quite young, its like their coming of age story where they get embroil in the MLs' worlds.

Both ML was diagnosed with ALS and what follows are their journey and struggles with the disease as well as how it affect everyone around them. Inspiring stories where they try to live life to the fullest with the help of their family, friends and loved ones

Tissues required. Bucket load of tears guarantee.

If you're looking for romance tragedy...
-ML in both dramas took advantage of their FL, then take over the others' tribe/country and killed her loved ones and people.
-They also uses other women to further their ambition.
-Yep, both MLs are possessive jerks.
-Both FLs because of duty and responsibility to save their people, refuses to be with ML and rather sacrifice themselves.