Recommendations

Both have a bittersweet romance between master and disciple.

Both MLs also made a vow to stay unmarried for life but their resolve got shaken when they meet the FL.

Now, We Are Breaking Up similar to Mood of the Day
A Strange Handsome Male Lead good in his profession interested in Hardworking Female Lead but not the other way at the beginning but then eventually she needs help professionally and since you are attracted to her you do help her with her work and then slowly hit it of. Yay!
Also has one night stand dynamic .

The plot and romance are very different but I am getting the same vibes so far

Talented FL with no education that strugles to make it
abusive foster family that FL still loves and helps
FL that stays true to her value despite all

Both Japanese movie were unique in the way that it is not Hollywood like. Very genuine, tradition, Asian sport. Respect, spirit, touch of love. Beautiful couple.

The young couple met when they were in college. Love growth. Move in together. Reality, job hunting challenge, put their love life in nightmare. They eventually walk their own path to build the foundation. Beautiful movies

Cute young couple love grow, Met, fell in love, living together, but poverty put their romance in hell. Separate, walked their own path. Beautiful yet reality

Two young love birds. Romance vs reality. Beautiful couple. Being poor is hard. Struggle with money and life, have to put love and romance to second.

Crook that catching crook. The main lead was a thief, a law breaker, a villain in the public eyes but the reality intention was to against the real evil. Lots of twisting plot.

Both movies about young man and an dementia parent. The struggle of the young man to dealt with the dementia parent. There were laughs moment. The parent has in and out moment of memory. Very sweet heart toughing movies.

In terms of story they are slightly different but are similar as to the relationship dynamics between the main couples and the psychological vibes. Both can be classified as romance that at some points have unsettling events happen between the couples.

1. There was Romance and that was a happy ending; a bittersweet one!
2. Not a shortage of tragedy events; be warn this is a war movie.
3. Very family oriented; this is the most heart breaking part of the series.
4. Based on actual historical events.

Started off with a fake marriage. FL marries in order to find out the murder of her father. She purposely gets close to the ML to get closer the his boss.

in both:
*FL is famous celebrity
*ML becomes bodyguard
*love/hate relationship

A love to kill is much better also dark drama.
If you liked this things in Nang Rai Tee Rak you can try this Kdrama.
Though I'm not sure if after "love to kill" it's proper recommendation (these dramas are on different level).

Both movies evolve between The young man and the old man relationship. The care free spirit of young man vs the discipline knowledgeable stubborn old man. Sweet and heart warming movies

Both movie involve man with big muscle. Both main lead had been through up and down, hard training, big strong man with sweet soft heart.