I am frankly impressed that Kdrama writers write such excellent time travel themed dramas. They come regularly but still manage to be fresh..Have listed my fave dramas ..Let me know yours 

• Nine times travel
• Tunnel
• Alice
• Queen In Hyun's man
• Kairos (airing)
• Meet me @1006 (Taiwan Drama)
• 18 again
• Rooftop prince

Some of my favorites are on your lists!

1. Someday or One day
2. Tunnel
3.  Splash Splash Love  (& adding):
4. Moon Lovers: Scarlet Heart Ryeo
5. Faith 

 Czakhareina:

For me, in addition to the ones youve listrd, i wanna add:

• Splash Splash Love
• Todome No Kiss (Japan)
• Life On Mars
• Someday or One Day (Taiwan) -transmigration
• Bpoop Phaeh saniwat (Thailand) - transmigration
• Boku Dake ga Inai Machi (Japan)
• Go Princess Go (China) - wacky slapstick drama with transmigration
• Gods Gift: 14 days
• Live Up To Your Name
• Nobunaga Concerto (Japan)
• Aishi Girl (Japan)
• Bu Bu Jingxin (China) - Transmigration 
• Train - though this is more parallel worlds travel

Train is something I wanted to see due to ML YSY...Maybe ill see it some day 

Life on Mars is also something I'd like to see

God's gift -i heard had a very bad ending and haven't seen it since then

As an hard core time travel fan, I really liked these dramas(not in order).

• Signal (2016) 
• Familiar Wife (2018)
• The Best Hit (2017)
• Go Back Couple (2017)
• Tomorrow With You( 2017)
• Live Up to Your Name (2017)
• Longing Heart(2018)
• Rooftop prince (2012)
• Someday or One Day (2019)
• Back to 1989

Man 2017 was the year of time travel dramas!!

Thanks for reminder.. 

My favorites are -

Nine times travel
signal ( korean ). I tried watching the Japanese version, but too late.. the korean version was too good for me
Alice
Rooftop prince ( old tt concept but the actors were so hilarious and authentic)

Am ‘forcing’ myself to watch kairos.. so far not that thrilling to me... maybe its the cast ... hmmm 

 Pytheos:

Thanks for reminder.. 

My favorites are -

Nine times travel
signal ( korean ). I tried watching the Japanese version, but too late.. the korean version was too good for me
Alice
Rooftop prince ( old tt concept but the actors were so hilarious and authentic)

Am ‘forcing’ myself to watch kairos.. so far not that thrilling to me... maybe its the cast ... hmmm 

The cast of Kairos may or may not work for many..so yes there

Also,I missed putting Faith in there..Its one of my faves

 Arihant D:

The cast of Kairos may or may not work for many..so yes there

Also,I missed putting Faith in there..Its one of my faves

Oh yes, Heard Faith is a good show. Shall put that on my watch list. Thanx.