CP violation (CPV) in charm decays is expected to be very small, hence challenging to observe experimentally. Observing such CPV could indicate New Physics (NP). Singly Cabbibo suppressed (SCS) such as D0→K_S^0 K_S^0 is expected to have enhanced interference with NP amplitudes. Such interference could generate large CPV. I will talk on the study of the decay D0→K_S^0 K_S^0 using 921 fb^−1 of data collected at or near the Upsilon(4S) and Upsilon(5S) resonances with the Belle detector at the KEKB asymmetric energy e+e− collider. Belle II, the next generation experiment at the intensity frontier that either reuses the Belle subdetectors or upgrades them, to achieve a 50 times larger data than Belle Detector. Expected precision on A_CP of the decay D0→KS0KS0 will be 0.2% with huge Belle II data sample, already accessing the precision with which NP could be observed. The high design luminosity of the SuperKEKB electron-positron collider is expected to result in challenging levels of beam-induced backgrounds in the interaction region. Properly simulating and mitigating these backgrounds is critical to the success of the Belle II experiment. I will mainly focus on the silicon vertex detector beam background simulation.