Sunny北岛无情
[sunny bĕi dăo wú qíng]
Sunny translates to '阳光', which means sunshine, while '北岛无情' is a phrase referring to someone being indifferent or cold-hearted like a place in the northern part of an island. Here '北岛' might be just a name of an artistic pseudonym and '无情' indicates not showing feelings, making the nickname imply that even in a bright and optimistic person, there can be a cold, unfeeling side.