(TMKOC) can be tricky as it is often proprietary background music (BGM). However, there are several fan-made and extracted versions available across popular ringtone platforms. Where to Download Bagha Ringtones
It is 100% real in the show. The sound effect was likely taken from a free online library of "Old Mobile Ringtones" or a Casio keyboard preset. tmkoc bagha mobile ringtone download