I'm not good at differentiating autumn (orange leaf?), spring (flower blooms?), and summer (sunny beach?) in drama, so mostly winter (white snow):
Autumn's Concerto (amnesia, single mom, past lover)
Destined ('arranged' marriage, politics, historical)
While You Were Sleeping (prophecy through dreams, solving/winning cases)
Winter Begonia (bromance, war period)
Winter Sonata (amnesia, accidents, past lover)
And I can't help but recommending movie The Himalayas (a journey to bring back a junior's dead body back to South Korea but it failed but it's so touching)