I guess you agree with North's (edited after hanp's note) pass in the first round.
If not you must have an exact agreement with your partner about the meaning of:
1NT, X
What is the difference in the meaning of X and 1NT?
1♠, 2♣, 2♦, 2♥
But in the balancing situation it must be 100% clear, that 2♥ shows a good 6-carder and some sort of trap-pass after 1♥.
This was the full deal:
With the ♦K onside 4♥ is an easy contract to make. Even if the K is offside there is a chance for 10 tricks.
But at least a part-score in ♥ should be reached.
Do you and your favourite partner have the tools to find the correct contract, if opponents bid your best suit first (by bluff or by chance as here)?
Al
East South West North
1♣ p 1♥ p
1♠ p 1NT p
2♣ p p ?