BY2 sisters, Miko and Yumi, have undergone a transformation not only in their names but also in their career trajectory. The duo, formerly known as BY2, has changed their names to Sun Huan and Sun Yu respectively, forming the new group "Raining Sun". This move is seen by many as a fresh start for the sisters after they parted ways with their original record label.

The reason behind this change is attributed to the expiration of their contract with Sea Butterfly Music. After leaving the company, BY2 established its own studio and decided to rebrand themselves. Their decision to alter their names has sparked debate among fans and netizens alike.

While some argue that changing one's name does not necessarily impact an artist's success or popularity, others believe that an artist's name holds significant importance in shaping public perception and influencing future opportunities. It is worth noting that entertainment industry often employs pseudonyms which are easily remembered by fans.

As for BY2's connection with Wang Likun (王力宏), it was reported that there were rumors of a close relationship between them on social media platforms such as chat apps. However these allegations were quickly refuted by both parties when BY2 took legal action against those spreading these claims. The controversy surrounding Liang Le (李靓蕾) and Wang Likun's divorce further fueled speculation about BY2's involvement with him.

In conclusion, while changes in name may be common practice within the entertainment industry for artists seeking a fresh start or wanting to distance themselves from past controversies; it remains uncertain whether such changes can directly influence an artist’s success or popularity without considering other factors like talent development and marketing strategies employed by management teams involved in managing celebrities' careers.