I thought that no episode aired on Feb. 15 because of the Korean New Year but according to MBC's schedule, no episode is set to air on Feb. 22 either. On the series' website (http://program.imbc.com/lovescenenumber), it also says that the broadcast ended on Feb. 8. From the looks of it, MBC might not air episodes #29 and #35...
EDIT: as I expected, MBC only planned to air two of the four love scenes : http://www.koreaherald.com/view.php?ud=20210201000961