Is Block B's Zico already working on a new song?

On November 20th,�Zico�tweeted, "I'm going to be writing lyrics all night long".

Zico is well-known for composing and producing many of Block B's songs, as well as various songs for many other artists. When fans saw the tweet, they wondered if Zico might be writing Block B's follow up song to "Nillili Mambo". Others pondered if he may be working on additional songs for his mixtape, 'Zico on the Block 1.5'. No matter what he may be working on, fans are excited to see what he could have in store for them.

What do you think he is working on?

Source: Zico's Twitter