Both "You've Fallen For Me" and "Because I Miss You" ranked #1 on Japanese ringtone charts, with "You've Fallen For Me" ranking #1 weekly and "Because I Miss You" ranking #1 daily. "Because I Miss You" is a song Yonghwa composed and wrote himself.
His drama hasn't aired in Japan after its conclusion in November 2012, so it's a surprise that his songs are suddenly hitting their way forward again 7 months after. However, it's not the first time something like this has happened as the song had suddenly ranked #1 in March as well.
It seems like fans just can't get enough of Yonghwa and his songs!