Both series are BL romantic comedy fluff of a similar type, even though the plot, actors, and everything else are different.
I don't really like either series, but I can see how others might enjoy it. Both feature a somewhat neurotic lead character and a more confident love interest, but rather than being shy about a secret crush, the lead in Wedding Plan is being pursued by the groom-to-be of the wedding he has been hired to plan. The bride-to-be actually encourages the groom to pursue the wedding planner, and in any case, she already has her own girl friend.
It is an odd situation that the already neurotic lead character isn't mentally prepared for (not that most anyone would be). Also the love interest teases the lead by sort of acting like an ass hole. I am slightly exaggerating the similarities here because the series are different, but it has the same vibe as Secret Crush.

It is genuinely amusing, but a little bit less flamboyant than Secret Crush, but regardless, neither series interested me. Wedding Plan isn't for me, but rather for someone that liked Secret Crush.

Another romance series with two boys in a lockdown/quarantine setting, but its more like "Like in the Movies" than "Gameboys."

Another romance series with two boys in a lockdown/quarantine setting. They go to the same school and must do a project for a class while being in lockdown at their respective homes.

Another romance series with two boys in a lockdown/quarantine setting. However, rather than being an online long-distance relationship, the two boys are living together.