Both drama deal with medical settings in extreme and dangerous situations after a natural disaster. They also have a splash of romance and some politics around the profession.

Both drama deal with:
Highschool,struggles, dreams, sports, comradeship, gender norms, growth through a common passion.

Both drama are wholesome slice of life whose main topic is dancing, human interactions and connections through dance and growth.

Both drama focus on a sick character who reunites with their past lover.
You will definitely cry watching both.

Same feeling.
Sick character finds love.
Tragedy that will tear your heart apart.
Really really emotional acting.
You will cry your eyes out.

Both drama deal with the topic of the secret identity of one of the main leads who tries his best to be with the mc despite everything. Heavy on the chemisty and flirting but where Love Better Than Immortality can be toxic, Word of Honour deals with evetything in such a subtle and responsible manner. The main similarity for me lies with the roles of Shangguan Qiu Yue and Wen Ke Xing.

Both drama have:a chef as a main character who time travels and finds true love and gets entangled in the conspiracies and intrigues of a different era. Both drama have a lot of funny moments although Mr Queen is more bittersweet and sad at times.

In both drama one can find: Body swap, intrigues and conspiracies. Moreover in both drama the main characters after a lot of struggle end up managing to actually help the people they love and ameliorate their life despite what their own ending is. both drama have lots of comedy yet they also contain a lot of heartwrenching moments.

Both have:
-fantasy and martial arts
-Strong, charismatic, powerful morally grey main leads
-painful pasts and misunderstandings.

Both drama are so deliciously painful.
The love! The sacrifice! The eternal suffering and romance that surpasses time and universes.

both drama have:
-Time travel/isekai
-a looooong romance plotline
-love triangle
-decisions decisions decisions
Love better than immortality is much more frustrating though

They both are time travel romance with a heavy love triangle plotline. Which at points is able to make your blood boil over the decisions and actions of the main characters. Although they deal with different eras.