Recommendations

In this drama the male lead return to school after 10 years and try to fight the education system and way the students are being discriminated on the basis of marks

Both have the same colors for the core team (Red, Yellow, Green, Blue, Pink) and ToQ 6ou is orange while Kiramai Silver is accented heavily with orange.

Both teams are said to shine (Kiramagers shine because their motif is gemstones while ToQgers shine because one of their motifs is rainbows/light) due to the power of imagination. (which is called Kiramentality in Kiramager). Imagination/Kiramentality power their weapons and mecha and the red of each team has the biggest amount of it.

Both teams started with the other four core rangers and have red added in the first episode to the team with the sixth ranger added later on. The sixth ranger is hesitant to join but quickly comes around.

The Mechas are vehicles for both teams. (ToQgers only have trains as their mech while Kiramagers have an assortment of different type of vehicles, including trains)

Both Villians groups want to harness dark from people.

As I mentioned in my Tiga recommendation, it was also the same as for Ultraman Dyna. Since as with Katsumi, R/B's Minato Isami/Blu also had a lot of similarities shared with Dyna aka Asuka Shin. And alongside reference to plots from Ultraman Tiga, R/B also contained a lot of parallels from Ultraman Dyna as well. So I'm definitely recommending both series because of the huge homage R/B had in connection to the series.

The older brother of the Minato brothers, Minato Katsumi was quite similar to Madoka Daigo who is the protagonist in Ultraman Tiga. And if you love R/B's plot and characters, you'll definitely love Tiga as R/B did draw a lot of reference to the series. You might as well call R/B as a series homage to Ultraman Tiga.

Another adaptation of the same novel.

Both have a male lead who time travels to the past into a Harem. Similar comedies in both but Man Comes to Tang Dynasty focuses more on the comedy aspect while Concubinage Record focuses more on case solving.

Also, the time travel is completely logic-less in Concubinage Record. ML possesses a body to time travel yet modern equipment also time traveled with him somehow.

It’s the similar working women type modern drama taking place in Shanghai. All the women are trying to get ahead at work and at home.

Investigation, Feel/vibe of the drama, Intelligent and Strong lead characters, Strong and Intelligent female lead, Plot twists and Cliffhangers!

Both feature a ghost mother leaving a child and husband behind. Also, in both media the husband becomes depressed/suicidal due to the incident of losing their wife. Both have the ghost only visible to a select character.

Both have amazing OSTs and cinematography. Both stories surround the mysterious circumstances of a student's fall from the rooftop. Both have really good lines and chemistry between all the characters.

Age of Youth is about life in 20's , while Be Melodramatic is about people in their 30's, it's like a more mature version of Age of Youth, with career hardships and growing up also facing yourself and your buried problems.

Both share the same plot without the murders. In "The inheritance", A rich business executive is dying and decides he wants to meet with his three illegitimate children before dying to see if they're worthy of including in his will. This sets up a mad scramble between his relatives and employees to see who can best finagle the situation to their advantage.

Both have daughters that go missing/kidnapped from wealthy families and are raised by poor parents. Both find their real parents after 20 or so years. Both are about forgiveness and redemption.

Previous film by the same director that instead of building the portrait of a Patriarch's testament, build a family story based on a Matriarch' s will.

The story about a lost spirit, finding his/her body to return. In Pope Rak, the main Female Lead is looking for her body and in Khun Pee Tee Ruk, the main Male Lead is looking for his body to return.