A handsome manhwa male lead is usually defined by his physical attractiveness, which includes well-defined facial features and a fit body. Additionally, he often demonstrates leadership skills, a sense of justice, and a capacity to protect those he cares about.
You typically can't kill the male lead in a manhwa. The story is built around them, and their presence drives the plot forward. Any attempt to do so would likely violate the established storyline and could lead to an unsatisfying or chaotic reading experience.
I'd recommend 'Twisted Love'. The yandere male lead's actions keep you on the edge of your seat. The plot has lots of twists and turns that make it stand out. The way the relationship develops is quite unique.
Typically, a female professor in manhwa is depicted as having a strong personality, being dedicated to her students' success, and facing various challenges in her academic career. Her appearance might vary, but her intellectual prowess and determination stand out.
Often, when the second male lead powers up, it adds a twist to the plot. It could lead to power struggles, new conflicts, or maybe even a shift in the readers' sympathies towards him.