EDIT: Of course, he's blocked me for sending a personal message that's why I cannot contact with him from private message. I don't want to open a new account in here to have a new red trust because of multiple account. How can I solve this issue without reaching him?
You cannot. Only the person who gave you the tag can remove it unless other DT members remove Jollygood from DT which will not happen without good reason. Giving you red trust is not a good enough reason. I'm sure he is getting notifications from this topic with his name being said so many times. If he is interested in giving you a chance he will respond, but don't get your hopes up.