The charm of the 22 seals

Be killed by someone (x) who loves you (y)
The first seal is to be killed by someone who truly loves you. That seals can be "tricked" by people who want the charm to work, because it also works if Y is killed knowing what's about to happen or if X doesn't do it on purpose. An exemple for that kind of situation could be, that Y puts poisen into a bottle that he know, X will make him drink of.

X falles in love with someone who remindes him of Y (z)
If X falles in love with Z, the second seal is broken. X doesn't have to fall in love with Z because he reminds him of Y.

X kills himself (optimally)
Most of all it's important that X dies. It's most likely that the charm will suceed, if he killes himself. However, it's possible that it works if X only dies of an exident, while he's still in love with Y.

Y seeks out X and makes him kneel
It also works the other way round. It's only important that X and Y find each other and X is willing to fulfill any of Y's wishes. Therefore, X has to kneel in front of Y symbolicly.