What will you do if you fell in love with your bestfriend and she has a boyfriend? What will you do if your bestfriend's beloved boyfriend is nearly dying? What will you do to make her happy? 

Nichkhun Horvejkul , a former beast idol of the Korean Pop Boygroup 2PM who fell apart and disbanded , Famous life wasnt easy for him including the hardships for being a beloved idol , Secrets cant be revealed , Personal life with no privacy at all especially revealing the biggest covered secret of his life , Being in a relationship with a fellow idol , Tiffany Hwang , Nichkhun's long term girlfriend , their relationship was revealed in April 4 , 2014 which made half of the fans happy and half of the fans sad and depressed they knew this would happen , that why they chose to stay the secret relationship covered for 4 months , They stood happy with each other though fans are'nt happy of their relationship most of them are the locksmiths , the TaeNy couple shippers , She and her bestfriend , fellow idol and member Taeyeon knew all about this , the ruckus , the things they do , They have been living life full of fanservice , saying that Tiffany is Taeyeon's wife and Taeyeon is Tiffany's wife in interviews , Holding hands like a real couple on stage during concerts yet for Tiffany it isnt a fanservice , She loves skinship towards her bestfriends , She is a very expressive girl , unlike Taeyeon she isnt , she likes skinship too but she was never an expressive type of person who can simply say i love you to the people she loves , She has been bestfriends with Tiffany for 10 years , being roommates since trainee days , Debuted together with 7 sisters , Taeyeon promised to herself she would never fall in love but something happened inside her , She has been crushing and deeply inlove with her bestfriend since their famous chart topping legendary song Gee era , She fell for her slowly , By the time her secret relationship with Nichkhun has been revealed , Her heart tore apart but she never stopped loving her, She still treated her like she does , She still care for her , She never acted cold towards her , She just stayed being the dorky Tae Tae her bestfriend loved in a friendly and sisterly love way , October 10 , 2014 , The group Girls Generation which both of them are members with , disbanded but they never lost in touch with each other they still treated each other like sisters , still living together in one dorm like how they lived during their idol days , February 16 , 2015 , Nichkhun had a weak heart making Tiffany sad and worry too much in her whole life , He is nearly dying , Tiffany cant do anything but cry to her bestfriend and tell her how sad she feels , Taeyeon her bestfriend knowing that Nichkhun could have a chance to be alive by giving him another heart has made a decision , To make her beloved bestfriend happy.