Music and sound aren't part of manhwa, obviously, but the way a scene is framed can create a similar tone. A silent, multi-panel sequence of a character breaking down can be more emotionally intense than a dialogue-heavy argument. The artistic direction is a content warning in visual language. Sharp angles, heavy shadows, and close-ups on distressed features convey heaviness. Bright, open panels with soft lines convey lightness. Learning to 'read' the art for emotional tone is a skill that helps you self-warn as you go.