Both dramas focus on the treatment of different psychiatric illnesses which may affect people’s daily lives.
The main lead of Shrink is the psychiatrist of a small psychiatric clinic whereas the main lead of Daily Dose of Sunshine is the newly transferred nurse in the neuropsychiatry department.

In both dramas, FL/ML likes the ML/FL since school days and they fell in love after meeting again years later.

Both dramas are similar as both main leads need to accomplish the mission in each story to get to the next story and eventually getting to the main goal (12th door/changing fate). The main lead in The Journey time-travels to the different times & places in her past lifetimes to help others resolve their past conflicts collecting a drop of tears from certain person (moving closer to changing her fate) whereas the main lead in The Spirealm enters the different doors with different stories/games to accomplish mission obtaining the key and clue to the next door (until they reach the final door).

Both are mystery/thriller rom-coms.
FL in MLL can hear other people’s lies as they talk whereas FL in GWIA has the ability to make rich guys who are liars/cheaters to fall in love with her after looking into her eyes.

Both are romance drama with main leads active in the voice acting/dubbing industry.
In both dramas, both ML are prominent voice actor in the industry whereas FL in TMBYITW is also a voice actress and FL in LMLMV is more about composing and creating ancient style music.

Both dramas have stories of childhood friends turning lovers and daily life stories (slice of life) of the different families in the same town/neighbourhood.

Actor Shin Hyun Seung starred as celebrity - newbie actor and idol singer in both dramas and both his characters have romance :)

Both Female Leads went back in time to the schooldays and meet the Male Leads once again. This time they got to understand each other better and fall in love quickly as compared to the original past hence changing their outcome in the the new future.

Both main characters have the ability/skill to enter into the inner world of people’s hearts (like a dream/hypnosis) to seek out clues to the truth or hidden truth of cases and may even be able to make clear of people’s forgotten memories kept deep within them.

Both are sports romance drama of which Love All Play focused only on Badminton whereas Weighlifting Fairy Kim Bok Joo covers Weightlifting, Swimming and Rhythmic gymnastics.
And also watch how the main couple become friends and then lovers.

Both are sports romance drama.
Both male leads are genius kind of player - Badminton in Love All Play and Figure Skating in To Fly With You.
In Love All Play, the female lead is back to Badminton after years after a scandal so she has to work hard to get back to condition whereas in To Fly With You, the female lead did not learn officially due to her Mum’s objection so she has to work hard to meet the requirement for professional athlete.

Both are sports (e-sports and ice skating) romance drama.
Both main leads dislike each other at first and fell in love with each other along the way while pursuing their dreams together in their respective fields. Both male leads are “genius” kind of player who meets a setback and need to start over again while both female leads are hardworking type who just started their professional training in order to pursue their dream.
Even the last scene in both dramas are kind of similar :)