If you're expecting to watch a romance drama, go somewhere else. I usually cry when the main couple separate. But the sadness in this drama comes from the dark history of both the ML and FL.
Yes there's some romance, and yes there's a happy ending. But watch out if mental illness, rape, suicide, or attempted murder triggers you, you might wanna pass on this.
Don't get me wrong, I love this drama. I think Taiwanese drama is so underrated, but there are some heavy issues that may strike a nerve.