Happy Ending Romance

Both shows feature the main lead in a love triangle with two other men. One of which he had been in a relationship with for a while, and the other who is a new love interest who knew the main lead before they got into their current relationship.

Similarities:
- Miniseries
- Korean BL
- One ML is an author (Yeon Seok in FLA, Cha Jung Woo in HER)

Differences:
- FLA has the reincarnation and first love trope
- HER has a love triangle

Both revolve around a codependent relationship between a senior and a junior in their respective fields of art (HER is literary while Double is performance art) as the junior eventually eclipses the senior in skill.

Both codependent relationships feature a popular, extroverted senior and a shy but talented junior and are hinted to be romantic but 'interrupted' by an outside influence - from there, the story differs.

Both have similar themes but are still very different in execution (Double >>>)

While Happy Ending Romance (HER) follows the literary world, Lovely Writer focuses more on the entertainment world. They both highlight (to different degrees) the happenings behind the glittery facade of their worlds. They both have jealousy, hypocrisy, friendship and faithfulness. LW is a bit faster paced, lots of flashbacks (they have the time) while HER makes steady progress forward.

Follows the highs and lows of careers in the literary/entertainment world and overcoming difficulties to achieve good outcomes.