Heartbeat ·심장이 뛴다If you have one heart but two to save, what you will going to do?

One middle aged women is admitted to the hospital in a coma. Yeon-hee, who has been searching for a heart to transplant to her daughter, who has critical heart disease, is begging middle aged women's gangster son, Whee-do, by giving him a fortune. But when the reasons for Whee-do's mom are revealed one by one, Yeon-hee, who became desperate, is teaming up with dangerous people.

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