Xiao YuYi's words made Xiao XiRan and YuYan frozen in shock. They did not expect for Xiao YuYi to agree helping them and even had an idea of pretending as YuYan. They subconsciously looked at each other with stunned expression before looking back at Xiao YuYi and when they open their mouth to speak, they don't know what to say. "Rin needs YanYan's blood to wake up." Xiao YuYi sweetly but has a bit of worries on her voice. She suddenly grabs YuYan's hand and added. "YanYan needs to promise YiYi not to die." Xiao YuYi's worried voice and expression made YuYan smile sweetly and nodded in response. She holds her twin sisters hand and hooked her finger with hers. YuYan uttered with assurance as she looked at her twin sister who has the same face as her. "Pinky promise! YuYan will not die. YuYan is strong. RinRin will play with us soon!" Before Xiao YuYi can respond, Xiao XiRan suddenly pulled his twin sisters together and gave them a big hug then finally said. "Love you both! Hurry! Both of you go change!" The twins nodded at the same time. They immediately stood up and left the kitchen and went to find a pair of pyjamas that they can wear before going back to meet Xiao XiRan. Xiao YuYi pretended as YuYan having a midnight snacks with Xiao XiRan while YuYan sneaked out to climb up on the tree next to Xiao XiRan's bed room. At first, it was hard for YuYan to climb up the tree since its too dark aside from the moonlight in the sky. Luckily they were being trained on how to use their senses to see in the dark. Although it took a several attempt for YuYan to climb on the tree, she was sure that no one will see her since the room below Xiao YuRin's bedroom was their empty playroom. When YuYan successfully made into Xiao YuRin's balcony, she was disappointed after finding out that the balcony door was actually locked! YuYan's face instantly turned dark. She wanted to destroy the door, but it will only make a noise. She tried different ways on how to open the door without making any sounds. Unfortunately, whatever she does, she failed To open the door. With disappointment, YuYan has no choice but to give up on trying to open the balcony door. She turned around and started to leave. When she climbed back on the window in the kitchen, YuYan immediately informed Xiao XiRan and Xiao YuYi about the door lock in Xiao YuRin's balcony. By then, Xiao XiRan and her twin sisters tried to think of a plan on how to sneak in. They stayed in the kitchen as they speak with each other in a low voice. The following day, their new plan has started. YuYan and Xiao XiRan decided to stay in the living room before they sleep to appear in everyone's eye. YuYan pretended not to speak just like the past few days. She behaves differently than she used to which made her parents continued to worry. Nonetheless, seeing Xiao XiRan staying with her made them feel assured that YuYan was comforted. They even allowed him to sleep in his baby sister's room. What they didn't know was at the same time; Xiao YuYi is up to something. Xiao YuYi deliberately asked permission from their parents for her to visit Xiao YuRin in his bedroom every night because she misses him a lot. Since Xiao YuYi behave better than YuYan, she was allowed to visit Xiao YuRin anytime, but she claims that she only wanted to give her brother a goodnight kiss. Her actions were not strange to everyone as she was a very loving child, but who would ever think that her purpose was to make sure that Xiao YuRin's balcony door is unlocked.