Korea doesn't start with Fishing, so unless Whosit or LiPing have figured out that they have Fishing, we really can't say anything about it.
And he'll figure it out when at 30H the WB's done, instead of at 50H. If Whosit grumbles about "What could they have built for 30H?", then we can list everything that costs 30H. Which would be the WB, a Chariot, or a Monument. Since a Chariot would require the Wheel, AH, and a worker connecting the horse, well, we know how likely that is around T32 or so.
And he'll figure it out when at 30H the WB's done, instead of at 50H. If Whosit grumbles about "What could they have built for 30H?", then we can list everything that costs 30H. Which would be the WB, a Chariot, or a Monument. Since a Chariot would require the Wheel, AH, and a worker connecting the horse, well, we know how likely that is around T32 or so.