remorse
懴 centers on the feeling of remorse: a deep regret or penitence for past actions.
懴 is a variant form of 懺. It combines 忄 (heart) with 韯, a component that likely contributes the sound and relates to cutting or piercing, suggesting a heart pierced by regret.
The heart radical 忄 beside the complex right side 韯 suggests a heart weighed down by sharp, cutting remorse.
For ザン, imagine a remorseful person sighing 'Zan!' as they regret their actions: Zan -> ザン, and the heart 忄 feels the sting.