When I read eyes color change, immediately I remember this Japanese movie.
The eye color changed indicate some supernatural power is going to happen

Both male lead were the high rank general in ancient time.
Both were time traveling Korean drama.
Both has a legend main lead.
Both are romantic, not separable couple over long journey and generation

Both were popular Korean time travel drama.
Both male lead has lots of action fighting scenes.
Both has romance

Both were popular time travel Korean drama
Both male lead were king or high rank general in ancient time.
Same female lead played on both drama

Both are time travel.
The male lead went in and out
Plots can be confusing as heck.
Some romance, some action, kind of mystery

Both drama are time travel.
Both has romance, Korean popular actors and actresses
Both has action triller plot.

Both are time traveler. Back and forth. Could be confusing.
Can be interesting if did right,
Science, robot, time capsule etc

Both are Korean movie with rock band.
Both bands facing many hardship, difficulty, life challenges
Both were disband, and reform.

Both are Korean movies with musical genre
Both movies the group facing cruel challenges and hardship
How their fate and future hold?
Heart touching movies

Both movies about forming a band and make it success and heard by many
They faces many challenges, they tried manny time.
They failed many times, they disbanded.
They group together, and …

Both are about a group of young people trying so hard to get their voice and music heart.
Talented and full of passion not necessary bring them success
Inspiration and sweet movies

Both Japanese movies about young high schoolers forming a band.
They face many challenges and difficulty.
Very cute and inspirstion