【System + Sign-in + Hiding + Playing Pigs and Eating Tigers + Upgrade and Development】
The protagonist Xiao Fan was originally a newly graduated Chinese major college student, whose soul traveled to a newly dead baby in another world.
He became a scholar at the age of thirteen, passed the imperial examination at the age of sixteen, and became a tribute scholar at the age of seventeen. Then he was selected by the prince and became the prince's tutor.
Prince Qin Xuan had an engagement with Jiang Yuli, the granddaughter of the general who guarded the country. As the wedding was approaching, Prince Qin Xuan found Xiao Fan and asked him to take his place in the bridal chamber.
Xiao Fan was shocked. Cuckolded Prince, are you going to die?
The prince had no choice but to say that he was a woman. Her real name was Qin Xuan, and she was peerless.
If he didn't agree after knowing the secret, he would die, so Xiao Fan had to agree.
At the critical moment, the system finally awakened. He had the Supreme Sign-in System, which claimed that there was nothing that could not be signed in.
"System, can I sign in to get another system?"
"System, can I sign in to get a universe?"

【系统+签到+苟+扮猪吃虎+升级发展】 主角萧凡本是一枚刚毕业的中文系大学生，灵魂穿越到异世界刚死的婴儿身上。 十三岁成为秀才，十六岁中举，十七岁成为贡士，随后他被太子选中，成为了太子侍读。 太子秦轩与镇国大将军孙女姜玉璃有婚约，大婚将至，太子秦轩找上了萧凡，让萧凡代替他洞房。 萧凡大惊，绿太子，不要命了？ 太子无奈只能说出来自己是女人，她真正的名字叫秦萱，绝色无双。 知道了秘密不答应会死，萧凡只能答应。 关键时候系统终于觉醒，他拥有的是至尊签到系统，号称没有东西不能签到获得。 “系统，我能签到再获得一个系统吗？” “系统，能签到得到一个宇宙吗？” 主角：萧凡,秦萱姜玉璃

苟在东宫，太子竟是女儿身！

Hiding in the East Palace, the prince turned out to be a girl!

hidingintheeastpalacetheprinceturnedouttobeagirl苟在东宫，太子竟是女儿身！

Series of 女帝666