Stage 3 ( Part 2).
I digged a bit for what exactly happened. C told me that she had told girl R that she loved guy F. I didn't know what exactly the conversation is but I did believe that conversation is the turning point. My conjecture is that, girl R didn't want to disappoint her best friend and she accepted guy S while I honestly believed the weird action by guy S was taught and encouraged by girl C. Still remember that's 18 Dec 2003. I kept talking to her up to like 5am and skip my classes =.=
I thought that would be the end.....guy S was back to HK for vacation. Undoubtedly, they all will have a big reunion and it was after the train event. Guy F knew about S and R and then phoned R at that night. He wanted to know why/what happen and whether R had feeling with him or something like that. R was so embarrassed but had to admit she had feeling with him but had to say " Their timing is off, is off", with crying tone. It's so obvious/easy for F to wonder why and keep asking. It linked to C