sooo i did some research...

(this may probably be inaccurate so call me a clown)

[BF Era] October 12, 2019 (Tuesday) when they changed hair colors

lets say that this is today (Wednesday)

2019 Today

[BF Era] November 4, 2019 (Monday)we got this.

What if they release teasers on April 27? (Monday) https://twitter.com/fantagiomusic_/status/1191278972354478081?s=19

[BF Era] Blue Flame MV was released on November 20, 2019 (Wednesday)

*16 days teasers period*

What if the MV release is on May 13? (Wednesday) cause they release MVs during Wednesday

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this was pure guesses only so don't expect HAHAHAHAH let's just wait for the announcement HAAHHAHAHAHAH