Mr. Sunshine - Set during the Japanese occupation of Korea and the years leading up to the occupation. It deals with romance, camaraderie, class differences, gender roles, Korean identity (including those who grow up abroad), and politics / rebellion. The ending is 98% tragic. The silver lining is that the FL lives to continue her fight.
Misty - This one follows a famous and fearless female reporter. It deals with murder, stigma, class, corruption, the role of journalists in society, and more. The end is slightly tragic, as the FL is betrayed by a flawed character and it is heavily implied that he kills himself. Although the FL's ending isn't all sunshine and roses, it's not too bad.
The Smile Has Left Your Eyes - This drama deals with adoption, mental health, forbidden love, and multiple murders. The ending is 99% tragic with the only silver lining being that the leads died together after telling each other they loved each other and knowing the truth about their past and the fact that they are not siblings.
My Ahjusshi - The main characters in this drama have been dealt crappy hands in life and are living miserably - more surviving than living. The drama deals with murder, stigma, infidelity, family obligations, corporate politics / corruption, and building meaningful relationships / finding happiness in life despite the unfairness and cruelty of the hands they have been dealt. Some fans were disappointed that the ML and FL did not have an explicitly romantic happy ending, but the ending is open to interpretation and is a happy one.
Come and Hug Me - This drama deals with complicated biological and non-biological family situations, murder, stigma, stalking, panic disorders and redemption. This one does not have a tragic ending.
Secret - This drama deals with murder, betrayal and revenge but it had a happy ending.
The Rise of Phoenixes - Deals with murder, revenge, and politics and the ending is tragic and I didn't enjoy the drama because of the ending. This is a historical drama.
Time - Deals with murder, class, corruption, attempted suicide, and a terminal illness. I don't remember whether it had a silver lining at the end for the FL, but the ML's storyline is completely tragic. I personally didn't enjoy this drama.