This could be seen when Wu Cheng (W.C) said to Emma,
"I'm too old for you."
Emma is a first-year student at her university
Meanwhile, WC is a 29-years-old post-graduate from Sandakan, Sabah, Malaysia
It was his final year at the university
Wu Cheng was acting as if he was in love with Emma but in an odd way like when he told Emma to get out of his room, playing with Emma's feelings when she refused to get out from the room
WC gets married to a 26-years-old blonde, she was a part-time model and studied in London
'WC' means 'Water Closet', the only name that used by Emma for Wu Cheng. Emma sent letters to WC but she received replies weeks later with a remark "Return to sender - W.C. has died". This was a mistake done by WC in faking his death to Emma
WC said his family only want a Chinese, who is intelligent, wealthy, has a good reputation of family history and a Catholic. But then, he got married to an English woman
WC acted as a mentor for Emma as he was the final year student and Emma was a first year student
He said that he loves Emma for the first and last time during his birthday party
He kissed Emma before his departure for Malaysia
Emma refused to leave WC's room even after she was repeatedly told to do so by WC
Emma told WC to accept her because she wanted to be with him. Words like, "WC, please don't go", and "I'm not yellow enough for you" shows how musch she wanted to be with WC.
Emma went to the airport to meet WC for the last time to show how meaningful WC is to her. She even sent letters to him, hoping that he would remember her