Okay, I can help you think of a pen name with two or three Chinese characters for your surname. You can be called 'Qin Muhan' or 'Qin Yuexin.' These two names had surnames and only two words, which were very suitable for a novel. You can also consider "Qin Mengxue" or "Qin Siyue". These two names also had surnames, but the three words were slightly longer than " Qin Muhan " and " Qin Yuexin ". They were also suitable for use in real-life novels. I hope these names can help you. I wish you success in your writing!