Rejected, He Married Her Sister

After four years of unwavering support and love, Zhou Fann is ready to make the ultimate commitment and propose to his college sweetheart, Lin Keer, at a festive gathering.     
But the joyous occasion turns bewildering when Lin unexpectedly turns him down, leaving their families shocked.  Just as Zhou prepares to depart with a broken heart, an unforeseen proposal from Lin's sister, Lin Yuer, halts him.  
Offering him a startling alternative, Lin Yuer challenges the very fabric of Zhou's intentions.  
Just as Zhou is about to reject her proposal, a mysterious voice announces the activation of the 'Lucky Choice System' in his head, presenting him with two life-changing options: reject Lin Yuer and receive a lucrative but unknown reward, or marry her within 24 hours for a guaranteed, system-chosen prize, including a starter gift pack and official system binding.  What will Zhou choose when the stakes are as high as love versus unprecedented success?"