Chloe:
Tomorrow With you, Age of Youth, season 1 and 2, Ode to Joy, Madame Antoine, Fight for my Way, School 2017, Missing 9, Love That Makes You Cry.
Jugglers and I'm not a Robot, if you didn't watch them, they are very recent. They have minor love triangles but really, nothing much - I myself hate love triangles and these ones didn't bother me much. You Who came from the Stars, and the Legend of the Blue Sea too.
And if I recall correctly Rich Man, Poor Woman and Can we Get married don't have love triangles either.
Got a lot to try. thanks