"We promised you that you'll be infinite.  We'll keep that promise." 

There will always be another infinity.  

I stood on a hill,

Stared up into the blue sky

And drew a lovely person from my heart.

"I don't know if I can open my eyes again if I close them."   

Myungsoo's diagnosed with lung cancer and when he's faced with death, the other members promise he'll be infinite, but how long will their promise last?  

I want to fly up to the ends of heavens,

Hug the breeze on the air,

And whisper with the winged angels.

“Don’t leave us.  As seven, we’re Infinite, because that’s who we are.  If we don’t have you, what will we be?” 

“One, two, three.”

“INFINITE FIGHTING!”

This was the start of their infinite journey.