Both are similar stories.
In both main leads go back in time to meet their true soulmate.
In both main leads are studying in college when they went back to Ayutthaya period.
Romance in both series a top notch. slow burn yet beautiful to watch.
Both are time travel to change something in past.
Mr.queen is Joseon era of korea, while Love upon a time is Ayutthaya period.
Both have comedy and beautiful romance.
Acting and Bgm are good.