The way to take one before to ready

 

Answer

Commentary

The way to take one before to ready

At first glance, it looks like we're going to discard 3m.

If you look to Three colors sequence of 6 7 8 , this hand is two before ready. 

You have to draw around 6s, and then, this hand can reach one before to ready. 

If you discard 6s, this hand can reach for ready hand by drawing 4 6 9m. 

Additionally this  6 9m waiting,

Can you see this Ryankan (double gut shot)　？？

And

"9 tiles role (ex; Straiight or three colors sequence) is considerable from 7 tiles"

You gotta remember this Mahjong proverb.

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Yokohama is beautiful port town.

Nippon maru is going to anchor Yokohama port tonight.

The Olympic emblem is shining before the ship.