She is heartbroken and devastated after:
* Her husband, the King, rejects her and chooses to be with the female lead, Jang Geum.
* Her son is killed by a poison intended for Jang Geum.
Lady Han, overwhelmed with grief and despair, chooses to end her life by jumping into a well.
This tragic scene is a pivotal moment in the drama, highlighting the consequences of power struggles and the heartbreak of loss.