Thank you ArthurNielsen for your answer.
I have decided to attend the open day in Nanjing in China cause it's just closer to me. Flights to Singapore weren't that cheap from Japan.
The thing about Nanjing is that it says "CV Submissions Only" on the website. I thought all open days were CV subsmissions only, is it going to be different in Nanjing? Just to make sure. If anybody knows please let me know since I will be be coming a long way for that open day.
Thanks and good luck to everybody.