Can some give me spoilers??

the brown haired girl ( the female lead ) she puts knife on her throat and as a result she loses her ability to speak forever also she has to spent rest of her life in wheel chair..
She did this all to herself because she wanted to prove her love to him ...
And the male lead becomes very happy and dumps the black hair girl and lives with the brown haired female lead ..the last image is like him rolling her wheel chair and she is very happy

Thank youuuu!!